Vestin

He cannot be initially attacked. Once you approach within his activation range he will steadily release 2 of the giant Punishers in the room at a time. If you do not clear them fast enough, two more will add and this will become intolerable.
Waves (95 Crown Elite Boss Guardian):
#2 
#2 - Fear
#2 
Once you have defeated all the Punishers, will un-shield and attack you.