Quote Originally Posted by noidentity View Post
The water boss is once of the easiest heroic boss in the game. Each time he splits all you have to do is click those defense crystals and all of the spawns are immediatly destroyed. Very easy dehydration achievement.
That's what I meant by "until you know the strat" ;-) Still, it's not trivial, you have to try it a few times to get positioning right, since he has a tendency to blow you team all over the prison - especially if you have sub-lvl 187 blues as gear