Sorry SE, but endgame won't work if you don't fix something.

[-Magister]

I'm well aware of delay but i still get cases where i see other people clear of the radius and getting hit by it.

What kind of delay is going on when it has to communicate between them and the server and then communicate between the server and me to tell me where they are and the server says "they are clear" yet it still hits them?

Even with you watching what happens is that the player moves out of AOE and the server registers them as still in the AOE because it checks every 300ms, now the server is about to kill that player but it still needs to send information to you so you get the information of the new player position at the same time that the boss's ability is about to go off but the server has already registered the first player as 'in the aoe' and will proceed to treat that character as if this were true without re-checking or verifying.