diff --git a/Samples/VpSharp.CSharp_Sample/Program.cs b/Samples/VpSharp.CSharp_Sample/Program.cs
index c889d59..3eb1778 100644
--- a/Samples/VpSharp.CSharp_Sample/Program.cs
+++ b/Samples/VpSharp.CSharp_Sample/Program.cs
@@ -1,5 +1,5 @@
 using VpSharp.Commands;
-using VpSharp.EventData;
+using VpSharp.Extensions;
 
 namespace VpSharp.CSharp_Sample;
 
@@ -21,7 +21,7 @@ internal static class Program
         var commands = s_client.UseCommands(new CommandsExtensionConfiguration {Prefixes = new[] {"/"}});
         commands.RegisterCommands<SayCommand>();
 
-        s_client.AvatarJoined += ClientOnAvatarJoined;
+        s_client.AvatarJoined.SubscribeAsync(async avatar => await s_client.SendMessageAsync($"Hello, {avatar.Name}!"));
 
         await s_client.ConnectAsync();
         await s_client.LoginAsync();
@@ -30,9 +30,4 @@ internal static class Program
 
         await Task.Delay(-1);
     }
-
-    private static async void ClientOnAvatarJoined(object? sender, AvatarJoinedEventArgs args)
-    {
-        await s_client.SendMessageAsync($"Hello, {args.Avatar.Name}!");
-    }
 }
diff --git a/Samples/VpSharp.VB_Sample/Program.vb b/Samples/VpSharp.VB_Sample/Program.vb
index c0e05e0..1255ddf 100644
--- a/Samples/VpSharp.VB_Sample/Program.vb
+++ b/Samples/VpSharp.VB_Sample/Program.vb
@@ -1,5 +1,6 @@
 Imports VpSharp.Commands
 Imports VpSharp.EventData
+Imports VpSharp.Extensions
 
 Module Program
     Private WithEvents _client As VirtualParadiseClient
@@ -19,6 +20,8 @@ Module Program
 
         _client = New VirtualParadiseClient(configuration)
         
+        _client.AvatarJoined.SubscribeAsync(Async Function(avatar) Await _client.SendMessageAsync($"Hello, {avatar.Name}"))
+        
         Dim commands = _client.UseCommands(New CommandsExtensionConfiguration With { .Prefixes = {"/"} })
         commands.RegisterCommands(GetType(SayCommand))
 
@@ -29,8 +32,4 @@ Module Program
 
         Await Task.Delay(- 1)
     End Function
-
-    Private Async Sub ClientOnAvatarJoined(sender As Object, args As AvatarJoinedEventArgs) Handles _client.AvatarJoined
-        Await _client.SendMessageAsync("Hello, " & args.Avatar.Name)
-    End Sub
 End Module
diff --git a/VpSharp/VpSharp.csproj b/VpSharp/VpSharp.csproj
index 56dcb7a..935b680 100644
--- a/VpSharp/VpSharp.csproj
+++ b/VpSharp/VpSharp.csproj
@@ -59,6 +59,7 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.1"/>
         <PackageReference Include="System.Drawing.Common" Version="7.0.0"/>
+        <PackageReference Include="System.Reactive" Version="5.0.0"/>
         <PackageReference Include="X10D" Version="3.2.0"/>
         <PackageReference Include="ZString" Version="2.5.0"/>
     </ItemGroup>
diff --git a/VpSharp/src/ClientExtensions/VirtualParadiseClientExtension.cs b/VpSharp/src/ClientExtensions/VirtualParadiseClientExtension.cs
index 8b0d6ab..9cb1619 100644
--- a/VpSharp/src/ClientExtensions/VirtualParadiseClientExtension.cs
+++ b/VpSharp/src/ClientExtensions/VirtualParadiseClientExtension.cs
@@ -1,4 +1,5 @@
-using VpSharp.EventData;
+using VpSharp.Entities;
+using VpSharp.EventData;
 
 namespace VpSharp.ClientExtensions;
 
@@ -27,7 +28,7 @@ public abstract class VirtualParadiseClientExtension
     ///     Called when a chat message is received.
     /// </summary>
     /// <param name="args">An object containing event data.</param>
-    protected internal virtual Task OnMessageReceived(MessageReceivedEventArgs args)
+    protected internal virtual Task OnMessageReceived(VirtualParadiseMessage message)
     {
         return Task.CompletedTask;
     }
diff --git a/VpSharp/src/EventData/AvatarJoinedEventArgs.cs b/VpSharp/src/EventData/AvatarJoinedEventArgs.cs
deleted file mode 100644
index 5dea39c..0000000
--- a/VpSharp/src/EventData/AvatarJoinedEventArgs.cs
+++ /dev/null
@@ -1,24 +0,0 @@
-using VpSharp.Entities;
-
-namespace VpSharp.EventData;
-
-/// <summary>
-///     Provides event arguments for <see cref="VirtualParadiseClient.AvatarJoined" />.
-/// </summary>
-public sealed class AvatarJoinedEventArgs : EventArgs
-{
-    /// <summary>
-    ///     Initializes a new instance of the <see cref="AvatarJoinedEventArgs" /> class.
-    /// </summary>
-    /// <param name="avatar">The newly-joined avatar.</param>
-    public AvatarJoinedEventArgs(VirtualParadiseAvatar avatar)
-    {
-        Avatar = avatar;
-    }
-
-    /// <summary>
-    ///     Gets the newly-joined avatar.
-    /// </summary>
-    /// <value>The newly-joined avatar.</value>
-    public VirtualParadiseAvatar Avatar { get; }
-}
diff --git a/VpSharp/src/EventData/AvatarLeftEventArgs.cs b/VpSharp/src/EventData/AvatarLeftEventArgs.cs
deleted file mode 100644
index 2c0b941..0000000
--- a/VpSharp/src/EventData/AvatarLeftEventArgs.cs
+++ /dev/null
@@ -1,24 +0,0 @@
-using VpSharp.Entities;
-
-namespace VpSharp.EventData;
-
-/// <summary>
-///     Provides event arguments for <see cref="VirtualParadiseClient.AvatarLeft" />.
-/// </summary>
-public sealed class AvatarLeftEventArgs : EventArgs
-{
-    /// <summary>
-    ///     Initializes a new instance of the <see cref="AvatarLeftEventArgs" /> class.
-    /// </summary>
-    /// <param name="avatar">The newly-departed avatar.</param>
-    public AvatarLeftEventArgs(VirtualParadiseAvatar avatar)
-    {
-        Avatar = avatar;
-    }
-
-    /// <summary>
-    ///     Gets the newly-departed avatar.
-    /// </summary>
-    /// <value>The newly-departed avatar.</value>
-    public VirtualParadiseAvatar Avatar { get; }
-}
diff --git a/VpSharp/src/EventData/InviteRequestReceivedEventArgs.cs b/VpSharp/src/EventData/InviteRequestReceivedEventArgs.cs
deleted file mode 100644
index ea7295e..0000000
--- a/VpSharp/src/EventData/InviteRequestReceivedEventArgs.cs
+++ /dev/null
@@ -1,22 +0,0 @@
-namespace VpSharp.EventData;
-
-/// <summary>
-///     Provides event arguments for <see cref="VirtualParadiseClient.InviteRequestReceived" />.
-/// </summary>
-public sealed class InviteRequestReceivedEventArgs : EventArgs
-{
-    /// <summary>
-    ///     Initializes a new instance of the <see cref="InviteRequestReceivedEventArgs" /> class.
-    /// </summary>
-    /// <param name="inviteRequest">The invite request.</param>
-    public InviteRequestReceivedEventArgs(InviteRequest inviteRequest)
-    {
-        InviteRequest = inviteRequest;
-    }
-
-    /// <summary>
-    ///     Gets the invite request.
-    /// </summary>
-    /// <value>The invite request.</value>
-    public InviteRequest InviteRequest { get; }
-}
diff --git a/VpSharp/src/EventData/JoinRequestReceivedEventArgs.cs b/VpSharp/src/EventData/JoinRequestReceivedEventArgs.cs
deleted file mode 100644
index f913028..0000000
--- a/VpSharp/src/EventData/JoinRequestReceivedEventArgs.cs
+++ /dev/null
@@ -1,22 +0,0 @@
-namespace VpSharp.EventData;
-
-/// <summary>
-///     Provides event arguments for <see cref="VirtualParadiseClient.JoinRequestReceived" />.
-/// </summary>
-public sealed class JoinRequestReceivedEventArgs : EventArgs
-{
-    /// <summary>
-    ///     Initializes a new instance of the <see cref="JoinRequestReceivedEventArgs" /> class.
-    /// </summary>
-    /// <param name="joinRequest">The join request.</param>
-    public JoinRequestReceivedEventArgs(JoinRequest joinRequest)
-    {
-        JoinRequest = joinRequest;
-    }
-
-    /// <summary>
-    ///     Gets the join request.
-    /// </summary>
-    /// <value>The join request.</value>
-    public JoinRequest JoinRequest { get; }
-}
diff --git a/VpSharp/src/EventData/MessageReceivedEventArgs.cs b/VpSharp/src/EventData/MessageReceivedEventArgs.cs
deleted file mode 100644
index f9d4035..0000000
--- a/VpSharp/src/EventData/MessageReceivedEventArgs.cs
+++ /dev/null
@@ -1,24 +0,0 @@
-using VpSharp.Entities;
-
-namespace VpSharp.EventData;
-
-/// <summary>
-///     Provides event arguments for <see cref="VirtualParadiseClient.MessageReceived" />.
-/// </summary>
-public sealed class MessageReceivedEventArgs : EventArgs
-{
-    /// <summary>
-    ///     Initializes a new instance of the <see cref="MessageReceivedEventArgs" /> class.
-    /// </summary>
-    /// <param name="message">The received message.</param>
-    public MessageReceivedEventArgs(VirtualParadiseMessage message)
-    {
-        Message = message;
-    }
-
-    /// <summary>
-    ///     Gets the message.
-    /// </summary>
-    /// <value>The message.</value>
-    public VirtualParadiseMessage Message { get; }
-}
diff --git a/VpSharp/src/Extensions/ObservableExtensions.cs b/VpSharp/src/Extensions/ObservableExtensions.cs
new file mode 100644
index 0000000..4a54d24
--- /dev/null
+++ b/VpSharp/src/Extensions/ObservableExtensions.cs
@@ -0,0 +1,21 @@
+using System.Reactive.Linq;
+
+namespace VpSharp.Extensions;
+
+/// <summary>
+///     Reactive extensions for <see cref="IObservable{T}" />.
+/// </summary>
+public static class ObservableExtensions
+{
+    /// <summary>
+    ///     Provides a way to subscribe to an observable using an asynchronous on-next handler.
+    /// </summary>
+    /// <param name="source">The source observable.</param>
+    /// <param name="onNextAsync">The asynchronous on-next handler.</param>
+    /// <typeparam name="T">The type of the observable.</typeparam>
+    /// <returns>A disposable object used to unsubscribe from the observable.</returns>
+    public static IDisposable SubscribeAsync<T>(this IObservable<T> source, Func<T, Task> onNextAsync)
+    {
+        return source.Select(arg => Observable.FromAsync(_ => onNextAsync(arg))).Concat().Subscribe();
+    }
+}
diff --git a/VpSharp/src/VirtualParadiseClient.Events.cs b/VpSharp/src/VirtualParadiseClient.Events.cs
index 65c2b91..6e3f2ea 100644
--- a/VpSharp/src/VirtualParadiseClient.Events.cs
+++ b/VpSharp/src/VirtualParadiseClient.Events.cs
@@ -1,97 +1,163 @@
-using VpSharp.EventData;
+using System.Reactive.Subjects;
+using VpSharp.Entities;
+using VpSharp.EventData;
 
 namespace VpSharp;
 
 public sealed partial class VirtualParadiseClient
 {
+    private readonly Subject<AvatarClickedEventArgs> _avatarClicked = new();
+    private readonly Subject<VirtualParadiseAvatar> _avatarJoined = new();
+    private readonly Subject<VirtualParadiseAvatar> _avatarLeft = new();
+    private readonly Subject<AvatarMovedEventArgs> _avatarMoved = new();
+    private readonly Subject<AvatarTypeChangedEventArgs> _avatarTypeChanged = new();
+    private readonly Subject<InviteRequest> _inviteRequestReceived = new();
+    private readonly Subject<JoinRequest> _joinRequestReceived = new();
+    private readonly Subject<VirtualParadiseMessage> _messageReceived = new();
+    private readonly Subject<ObjectBumpEventArgs> _objectBump = new();
+    private readonly Subject<ObjectChangedEventArgs> _objectChanged = new();
+    private readonly Subject<ObjectClickedEventArgs> _objectClicked = new();
+    private readonly Subject<ObjectCreatedEventArgs> _objectCreated = new();
+    private readonly Subject<ObjectDeletedEventArgs> _objectDeleted = new();
+    private readonly Subject<TeleportedEventArgs> _teleported = new();
+    private readonly Subject<DisconnectReason> _universeServerDisconnected = new();
+    private readonly Subject<UriReceivedEventArgs> _uriReceived = new();
+    private readonly Subject<DisconnectReason> _worldServerDisconnected = new();
+
     /// <summary>
     ///     Occurs when an avatar has clicked another avatar.
     /// </summary>
-    public event EventHandler<AvatarClickedEventArgs>? AvatarClicked;
+    public IObservable<AvatarClickedEventArgs> AvatarClicked
+    {
+        get => _avatarClicked;
+    }
 
     /// <summary>
     ///     Occurs when an avatar has entered the vicinity of the client.
     /// </summary>
-    public event EventHandler<AvatarJoinedEventArgs>? AvatarJoined;
+    public IObservable<VirtualParadiseAvatar> AvatarJoined
+    {
+        get => _avatarJoined;
+    }
 
     /// <summary>
     ///     Occurs when an avatar has left the vicinity of the client.
     /// </summary>
-    public event EventHandler<AvatarLeftEventArgs>? AvatarLeft;
+    public IObservable<VirtualParadiseAvatar> AvatarLeft
+    {
+        get => _avatarLeft;
+    }
 
     /// <summary>
     ///     Occurs when an avatar has changed their position or rotation.
     /// </summary>
-    public event EventHandler<AvatarMovedEventArgs>? AvatarMoved;
+    public IObservable<AvatarMovedEventArgs> AvatarMoved
+    {
+        get => _avatarMoved;
+    }
 
     /// <summary>
     ///     Occurs when an avatar has changed their type.
     /// </summary>
-    public event EventHandler<AvatarTypeChangedEventArgs>? AvatarTypeChanged;
+    public IObservable<AvatarTypeChangedEventArgs> AvatarTypeChanged
+    {
+        get => _avatarTypeChanged;
+    }
 
     /// <summary>
     ///     Occurs when an invite request has been received.
     /// </summary>
-    public event EventHandler<InviteRequestReceivedEventArgs>? InviteRequestReceived;
+    public IObservable<InviteRequest> InviteRequestReceived
+    {
+        get => _inviteRequestReceived;
+    }
 
     /// <summary>
     ///     Occurs when a join request has been received.
     /// </summary>
-    public event EventHandler<JoinRequestReceivedEventArgs>? JoinRequestReceived;
+    public IObservable<JoinRequest> JoinRequestReceived
+    {
+        get => _joinRequestReceived;
+    }
 
     /// <summary>
     ///     Occurs when a chat message or console message has been received.
     /// </summary>
-    public event EventHandler<MessageReceivedEventArgs>? MessageReceived;
+    public IObservable<VirtualParadiseMessage> MessageReceived
+    {
+        get => _messageReceived;
+    }
 
     /// <summary>
     ///     Occurs when a bump phase has changed for an object.
     /// </summary>
-    public event EventHandler<ObjectBumpEventArgs>? ObjectBump;
+    public IObservable<ObjectBumpEventArgs> ObjectBump
+    {
+        get => _objectBump;
+    }
 
     /// <summary>
     ///     Occurs when an object has been changed.
     /// </summary>
-    public event EventHandler<ObjectChangedEventArgs>? ObjectChanged;
+    public IObservable<ObjectChangedEventArgs> ObjectChanged
+    {
+        get => _objectChanged;
+    }
 
     /// <summary>
     ///     Occurs when an avatar has clicked an object.
     /// </summary>
-    public event EventHandler<ObjectClickedEventArgs>? ObjectClicked;
+    public IObservable<ObjectClickedEventArgs> ObjectClicked
+    {
+        get => _objectClicked;
+    }
 
     /// <summary>
     ///     Occurs when an object has been created.
     /// </summary>
-    public event EventHandler<ObjectCreatedEventArgs>? ObjectCreated;
+    public IObservable<ObjectCreatedEventArgs> ObjectCreated
+    {
+        get => _objectCreated;
+    }
 
     /// <summary>
     ///     Occurs when an object has been deleted.
     /// </summary>
-    public event EventHandler<ObjectDeletedEventArgs>? ObjectDeleted;
+    public IObservable<ObjectDeletedEventArgs> ObjectDeleted
+    {
+        get => _objectDeleted;
+    }
 
     /// <summary>
     ///     Occurs when an avatar has requested this client to teleport.
     /// </summary>
-    public event EventHandler<TeleportedEventArgs>? Teleported;
+    public IObservable<TeleportedEventArgs> Teleported
+    {
+        get => _teleported;
+    }
 
     /// <summary>
     ///     Occurs when the client has been disconnected from the universe server.
     /// </summary>
-    public event EventHandler<DisconnectedEventArgs>? UniverseServerDisconnected;
+    public IObservable<DisconnectReason> UniverseServerDisconnected
+    {
+        get => _universeServerDisconnected;
+    }
 
     /// <summary>
     ///     Occurs when an avatar has sent a URI to this client.
     /// </summary>
-    public event EventHandler<UriReceivedEventArgs>? UriReceived;
+    public IObservable<UriReceivedEventArgs> UriReceived
+    {
+        get => _uriReceived;
+    }
+
 
     /// <summary>
     ///     Occurs when the client has been disconnected from the world server.
     /// </summary>
-    public event EventHandler<DisconnectedEventArgs>? WorldServerDisconnected;
-
-    private void RaiseEvent<T>(EventHandler<T>? eventHandler, T args)
-        where T : EventArgs
+    public IObservable<DisconnectReason> WorldServerDisconnected
     {
-        eventHandler?.Invoke(this, args);
+        get => _worldServerDisconnected;
     }
 }
diff --git a/VpSharp/src/VirtualParadiseClient.NativeEvents.cs b/VpSharp/src/VirtualParadiseClient.NativeEvents.cs
index efc77c2..aa60496 100644
--- a/VpSharp/src/VirtualParadiseClient.NativeEvents.cs
+++ b/VpSharp/src/VirtualParadiseClient.NativeEvents.cs
@@ -74,16 +74,15 @@ public sealed partial class VirtualParadiseClient
                 style = (FontStyle)vp_int(sender, IntegerAttribute.ChatEffects);
             }
 
-            VirtualParadiseAvatar? avatar = GetAvatar(session);
+            VirtualParadiseAvatar avatar = GetAvatar(session)!;
             message = new VirtualParadiseMessage((MessageType)type, name, content, avatar, style, color);
         }
 
-        var args = new MessageReceivedEventArgs(message);
-        RaiseEvent(MessageReceived, args);
+        _messageReceived.OnNext(message);
 
         foreach (VirtualParadiseClientExtension extension in _extensions)
         {
-            extension.OnMessageReceived(args);
+            extension.OnMessageReceived(message);
         }
     }
 
@@ -92,9 +91,7 @@ public sealed partial class VirtualParadiseClient
         VirtualParadiseAvatar avatar = ExtractAvatar(sender);
         avatar = AddOrUpdateAvatar(avatar);
         avatar.User = await GetUserAsync(vp_int(sender, IntegerAttribute.UserId)).ConfigureAwait(false);
-
-        var args = new AvatarJoinedEventArgs(avatar);
-        RaiseEvent(AvatarJoined, args);
+        _avatarJoined.OnNext(avatar);
     }
 
     private void OnAvatarChangeNativeEvent(nint sender)
@@ -119,14 +116,14 @@ public sealed partial class VirtualParadiseClient
             rotation = Rotation.CreateFromTiltYawRoll(pitch, yaw, 0);
         }
 
-        VirtualParadiseAvatar? avatar = GetAvatar(session);
+        VirtualParadiseAvatar avatar = GetAvatar(session)!;
         if (type != avatar.Type)
         {
             int oldType = avatar.Type;
             avatar.Type = type;
 
             var args = new AvatarTypeChangedEventArgs(avatar, type, oldType);
-            RaiseEvent(AvatarTypeChanged, args);
+            _avatarTypeChanged.OnNext(args);
         }
 
         Location oldLocation = avatar.Location;
@@ -136,7 +133,7 @@ public sealed partial class VirtualParadiseClient
         if (position != oldLocation.Position || rotation != oldLocation.Rotation)
         {
             var args = new AvatarMovedEventArgs(avatar, newLocation, oldLocation);
-            RaiseEvent(AvatarMoved, args);
+            _avatarMoved.OnNext(args);
         }
     }
 
@@ -149,11 +146,9 @@ public sealed partial class VirtualParadiseClient
             session = vp_int(sender, IntegerAttribute.AvatarSession);
         }
 
-        VirtualParadiseAvatar? avatar = GetAvatar(session);
+        VirtualParadiseAvatar avatar = GetAvatar(session)!;
         _avatars.TryRemove(session, out VirtualParadiseAvatar _);
-
-        var args = new AvatarLeftEventArgs(avatar);
-        RaiseEvent(AvatarLeft, args);
+        _avatarLeft.OnNext(avatar);
     }
 
     private async void OnObjectNativeEvent(nint sender)
@@ -179,9 +174,9 @@ public sealed partial class VirtualParadiseClient
         }
         else
         {
-            VirtualParadiseAvatar? avatar = GetAvatar(session);
+            VirtualParadiseAvatar avatar = GetAvatar(session)!;
             var args = new ObjectCreatedEventArgs(avatar, virtualParadiseObject);
-            RaiseEvent(ObjectCreated, args);
+            _objectCreated.OnNext(args);
         }
     }
 
@@ -196,7 +191,7 @@ public sealed partial class VirtualParadiseClient
             session = vp_int(sender, IntegerAttribute.AvatarSession);
         }
 
-        VirtualParadiseAvatar? avatar = GetAvatar(session);
+        VirtualParadiseAvatar avatar = GetAvatar(session)!;
         VirtualParadiseObject? cachedObject = null;
 
         if (_objects.TryGetValue(objectId, out VirtualParadiseObject? virtualParadiseObject))
@@ -217,8 +212,8 @@ public sealed partial class VirtualParadiseClient
             AddOrUpdateObject(virtualParadiseObject);
         }
 
-        var args = new ObjectChangedEventArgs(avatar, cachedObject, virtualParadiseObject);
-        RaiseEvent(ObjectChanged, args);
+        var args = new ObjectChangedEventArgs(avatar, cachedObject, virtualParadiseObject!);
+        _objectChanged.OnNext(args);
     }
 
     private async void OnObjectDeleteNativeEvent(nint sender)
@@ -247,7 +242,7 @@ public sealed partial class VirtualParadiseClient
         _objects.TryRemove(objectId, out VirtualParadiseObject _);
 
         var args = new ObjectDeletedEventArgs(avatar!, objectId, virtualParadiseObject!);
-        RaiseEvent(ObjectDeleted, args);
+        _objectDeleted.OnNext(args);
     }
 
     private async void OnObjectClickNativeEvent(nint sender)
@@ -267,10 +262,10 @@ public sealed partial class VirtualParadiseClient
             clickPoint = new Vector3d(x, y, z);
         }
 
-        VirtualParadiseAvatar? avatar = GetAvatar(session);
+        VirtualParadiseAvatar avatar = GetAvatar(session)!;
         VirtualParadiseObject virtualParadiseObject = await GetObjectAsync(objectId).ConfigureAwait(false);
         var args = new ObjectClickedEventArgs(avatar, virtualParadiseObject, clickPoint);
-        RaiseEvent(ObjectClicked, args);
+        _objectClicked.OnNext(args);
     }
 
     private async void OnWorldListNativeEvent(nint sender)
@@ -343,8 +338,7 @@ public sealed partial class VirtualParadiseClient
             reason = (DisconnectReason)vp_int(sender, IntegerAttribute.DisconnectErrorCode);
         }
 
-        var args = new DisconnectedEventArgs(reason);
-        RaiseEvent(WorldServerDisconnected, args);
+        _worldServerDisconnected.OnNext(reason);
     }
 
     private void OnUniverseDisconnectNativeEvent(nint sender)
@@ -355,8 +349,7 @@ public sealed partial class VirtualParadiseClient
             reason = (DisconnectReason)vp_int(sender, IntegerAttribute.DisconnectErrorCode);
         }
 
-        var args = new DisconnectedEventArgs(reason);
-        RaiseEvent(UniverseServerDisconnected, args);
+        _universeServerDisconnected.OnNext(reason);
     }
 
     private void OnUserAttributesNativeEvent(nint sender)
@@ -424,10 +417,10 @@ public sealed partial class VirtualParadiseClient
             clickPoint = new Vector3d(x, y, z);
         }
 
-        VirtualParadiseAvatar? avatar = GetAvatar(session);
-        VirtualParadiseAvatar? clickedAvatar = GetAvatar(clickedSession);
+        VirtualParadiseAvatar avatar = GetAvatar(session)!;
+        VirtualParadiseAvatar clickedAvatar = GetAvatar(clickedSession)!;
         var args = new AvatarClickedEventArgs(avatar, clickedAvatar, clickPoint);
-        RaiseEvent(AvatarClicked, args);
+        _avatarClicked.OnNext(args);
     }
 
     private async void OnTeleportNativeEvent(nint sender)
@@ -453,14 +446,14 @@ public sealed partial class VirtualParadiseClient
             worldName = vp_string(sender, StringAttribute.TeleportWorld);
         }
 
-        VirtualParadiseWorld? world = string.IsNullOrWhiteSpace(worldName)
+        VirtualParadiseWorld world = (string.IsNullOrWhiteSpace(worldName)
             ? CurrentWorld
-            : await GetWorldAsync(worldName).ConfigureAwait(false);
+            : await GetWorldAsync(worldName).ConfigureAwait(false))!;
         var location = new Location(world, position, rotation);
 
-        VirtualParadiseAvatar? avatar = GetAvatar(session);
+        VirtualParadiseAvatar avatar = GetAvatar(session)!;
         var args = new TeleportedEventArgs(avatar, location);
-        RaiseEvent(Teleported, args);
+        _teleported.OnNext(args);
     }
 
     private async void OnObjectBumpEndNativeEvent(nint sender)
@@ -474,11 +467,11 @@ public sealed partial class VirtualParadiseClient
             objectId = vp_int(sender, IntegerAttribute.ObjectId);
         }
 
-        VirtualParadiseAvatar? avatar = GetAvatar(session);
+        VirtualParadiseAvatar avatar = GetAvatar(session)!;
         var vpObject = await GetObjectAsync(objectId).ConfigureAwait(false);
 
         var args = new ObjectBumpEventArgs(avatar, vpObject, BumpPhase.End);
-        RaiseEvent(ObjectBump, args);
+        _objectBump.OnNext(args);
     }
 
     private void OnUrlNativeEvent(nint sender)
@@ -499,10 +492,10 @@ public sealed partial class VirtualParadiseClient
             return;
         }
 
-        VirtualParadiseAvatar? avatar = GetAvatar(session);
+        VirtualParadiseAvatar avatar = GetAvatar(session)!;
         var uri = new Uri(url);
         var args = new UriReceivedEventArgs(uri, target, avatar);
-        RaiseEvent(UriReceived, args);
+        _uriReceived.OnNext(args);
     }
 
     private async void OnObjectBumpBeginNativeEvent(nint sender)
@@ -516,11 +509,11 @@ public sealed partial class VirtualParadiseClient
             objectId = vp_int(sender, IntegerAttribute.ObjectId);
         }
 
-        VirtualParadiseAvatar? avatar = GetAvatar(session);
+        VirtualParadiseAvatar avatar = GetAvatar(session)!;
         var vpObject = await GetObjectAsync(objectId).ConfigureAwait(false);
 
         var args = new ObjectBumpEventArgs(avatar, vpObject, BumpPhase.Begin);
-        RaiseEvent(ObjectBump, args);
+        _objectBump.OnNext(args);
     }
 
     private async void OnJoinNativeEvent(nint sender)
@@ -538,8 +531,7 @@ public sealed partial class VirtualParadiseClient
 
         VirtualParadiseUser user = await GetUserAsync(userId).ConfigureAwait(false);
         var joinRequest = new JoinRequest(this, requestId, name, user);
-        var args = new JoinRequestReceivedEventArgs(joinRequest);
-        RaiseEvent(JoinRequestReceived, args);
+        _joinRequestReceived.OnNext(joinRequest);
     }
 
     private async void OnInviteNativeEvent(nint sender)
@@ -570,12 +562,11 @@ public sealed partial class VirtualParadiseClient
             worldName = vp_string(sender, StringAttribute.InviteWorld);
         }
 
-        VirtualParadiseWorld? world = await GetWorldAsync(worldName).ConfigureAwait(false);
+        VirtualParadiseWorld world = (await GetWorldAsync(worldName).ConfigureAwait(false))!;
         VirtualParadiseUser user = await GetUserAsync(userId).ConfigureAwait(false);
 
         var location = new Location(world, position, rotation);
         var request = new InviteRequest(this, requestId, avatarName, user, location);
-        var args = new InviteRequestReceivedEventArgs(request);
-        RaiseEvent(InviteRequestReceived, args);
+        _inviteRequestReceived.OnNext(request);
     }
 }