//
// SERVER side
//
if ( SERVER ) then
	//
	// Initialization
	//

	// Add the net-messages we need to the pool
	util.AddNetworkString( "ChatMessage" );

	// Add our "npc to xp" table...
	local class = {
		// Enemy Classes and XP to gain...
		npc_zombie				= 10;
		npc_fastzombi			= 10;
		npc_fastzombie_torso	= 4;
		npc_headcrab_poison		= 12;
		npc_zombie_torso		= 3;
		npc_zombin				= 15;
		npc_headcrab			= 6;
		npc_headcrab_fast		= 5;
		npc_headcrab_black		= 9;
		npc_antlion				= 7;
		npc_antlionguard		= 350;

		// Default is our fall-back method..
		default					= 1;
	};


	//
	// With hooks we only want to return non-nil for specific behavior.. You returned nil so you're fine but I condensed it all to 1 line..
	//
	hook.Add( "PlayerDeath", "XPOnNPCDeath", function( victim, killer, _w )
		if ( IsValid( victim ) && IsValid( killer ) && killer:IsPlayer( ) && victim:IsNPC( ) ) then
			// Use the npc class to xp table above for xp if the npc exists, otherwise use the default value...
			local _xp = class[ victim:GetClass( ) ] || class.default;

			// Add XP
			killer:AddXP( _xp );

			// Network it... ( You can also now use this in ANY code you write to network a chat-message )
			net.Start( "ChatMessage" );
				// The actual message is "+<XP GIVEN> EXP Added!"
				net.WriteString( "+" .. _xp .. " EXP Added!" );

				// The color we want the chat-message to be for adding xp...
				net.WriteColor( Color( 0, 155, 0, 255 ) );
			net.Send( killer );
		end
	end );
else
	//
	// This is the CLIENT side
	//


	//
	// Add a networking receiver for ChatMessage...
	//
	net.Receive( "ChatMessage", function( _len )
		// Read the chat text or use "N/A" if none-received... although there should always be one..
		local _text = net.ReadString( ) || "N/A";

		// Read the color, or use a default white color if none received...
		local _color = net.ReadColor( ) || color_white;

		// Now, add it to the client chat-window and play a sound...
		chat.AddText( _color, _text );
		chat.PlaySound( );
	end );
end
			if(victim:GetClass() == "npc_antlionguard") then
				for k,v in pairs(player.GetAll()) do
					if v == killer then
						GAMEMODE:Notify(v, 1, 4, "Nice job! You defeated the Boss! You have earned and 350 EXP!")
					else
						GAMEMODE:Notify(v, 1, 4, "Player " .. killer:Name() .. " has defeated the infected boss, and gained 1500 EXP!")
					end
				end
			end
		end
	end
	hook.Add("OnNPCKilled","Levelsystem_NKilled",NPCKilled)