Nightmare, Wizard.

Step 1: Accidently walk over black !@#$ and get stuck in Diablo cage
Step 2: Poison Hydra does just enough DPS to get diablo to go to Phase 2 of fight (where he puts you in 'realm of terror')
Step 3: Die... because you cannot do anything because diablo has stun locked you from the cage you were previously in... the cage is graphically removed as you are teleported to the realm of terror... but you're actually still fkn stunned... forever... and therefore cannot defend yourself when your 'clone'/giant %^-* off meteor smashes you in the face..