[Q] Rpg Combat System (anti Cheat)

Hey Photons!
I just managed to create a first Version of the game I want to make including Lobbies, first Map and animated Characters that can walk around.
What I am now thinking about is a Rpg Spell/Combat System like in WoW or LoL.

Can someone point me into a direction?
I know basicly how Counterstrike works, do I need also a delay to properly track f.e. Counter Spells and get the same result on all Screens?

Have a nice day :)

Answers