Invincibility bug - INFO
As of November 21 2011, Jad is bugged and is invincible to some players. This is the process in which it occurs
Jad appears in wave 63. you begin to attack him
Jad is at half HP, he summons his healers
Exactly at the moment the healers spawn, he heals to 100%, and does not get anymore damage.
The healers start healing him, you attack them and tank them
EVERY single hit on him will appear as damage, you will recieve exp, but it will not physically damage him or reduce his HP. This has been proven with only range and melee, unsure of magic.
Myself and 3 other players tried Jad, i experienced the bug, one friend also experienced it and the other two did not have the issue whatsoever