[2] Report: what rule(s) they broke (quote them)..
And
[3] Did this affect anyone (e.g. they were using their hacks in PvP)?
Everyone was affected. He used some kind of hacks that killed everyone at first. He did that multiple times and everyone was annoyed.
I warned him once then he left the game. But came back with a different account and used a different hack that made him summon countless birds which caused heavy lag in game.
[4] Evidence. (If this includes chat, Phase link one or more messages)
I hate this man, but I think there were other hackers as well. As accomplices. But i couldnt get evidences as we were literally getting killed every second, then the game ends.