A battle that makes use of you losing... Boss has a 100% immunity and 100% critical and pierce... The objective, to survive say 10 rounds as "NPC" rigs up a poison to knock the boss out, but doing so would knock you out too... When you return, the fight starts again, but the boss as a 10 turn aura with self stunned.. this is your time to strike... If failure, the boss goes back to his/her previous state, as the NPC has to rig up a new poison.... Think Jabberwocky.. but this takes into account of you actually dying and using dungeon recall