Concrete class prototype

src/Discord.Net.WebSocket/Entities/Messages/ISocketMessage.cs

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+using Model = Discord.API.Message;
+
+namespace Discord.WebSocket
+{
+    internal interface ISocketMessage : IMessage
+    {
+        DiscordSocketClient Discord { get; }
+        new ISocketMessageChannel Channel { get; }
+
+        void Update(Model model);
+        ISocketMessage Clone();
+    }
+}

src/Discord.Net.WebSocket/Entities/Messages/SocketSystemMessage.cs

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+using Discord.Rest;
+using Model = Discord.API.Message;
+
+namespace Discord.WebSocket
+{
+    internal class SocketSystemMessage : SystemMessage, ISocketMessage
+    {
+        internal override bool IsAttached => true;
+
+        public new DiscordSocketClient Discord => base.Discord as DiscordSocketClient;
+        public new ISocketMessageChannel Channel => base.Channel as ISocketMessageChannel;
+
+        public SocketSystemMessage(ISocketMessageChannel channel, IUser author, Model model) 
+            : base(channel, author, model)
+        {
+        }
+
+        public ISocketMessage Clone() => MemberwiseClone() as ISocketMessage;
+    }
+}

src/Discord.Net.WebSocket/Entities/Messages/SocketUserMessage.cs

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+using Discord.Rest;
+using Model = Discord.API.Message;
+
+namespace Discord.WebSocket
+{
+    internal class SocketUserMessage : UserMessage, ISocketMessage
+    {
+        internal override bool IsAttached => true;
+
+        public new DiscordSocketClient Discord => base.Discord as DiscordSocketClient;
+        public new ISocketMessageChannel Channel => base.Channel as ISocketMessageChannel;
+
+        public SocketUserMessage(ISocketMessageChannel channel, IUser author, Model model) 
+            : base(channel, author, model)
+        {
+        }
+
+        public ISocketMessage Clone() => MemberwiseClone() as ISocketMessage;
+    }
+}