I would add:
the character cannot have auras that can do damage, only iron golem can be crafted from an item like that (i mean here holy shock/freeze/fire, because they can finish the opponent)
the revive can be used, but only for 180 seconds, if the time is over and both alive then the revive user lost the battle (this can rule the infinite revive bug)
btw some said iron golem from exile could be op since they can cast life-tap and also could have high def. High lvl (like 50+) IG does 60-70 max damage, with the support of the best offensive aura from an item (Pride's lvl20 conc adds extra 345ed) holding by the character it is like 300 damage, can be a bit more if the base pala shield has the ed/ar (65ed/121ar) combo and not the resist one. Def can go up high (10k+) and could benefit from it during the battle but life tap curse has only 15% to cast on striking, only lvl5 which is 25 seconds only, and u can do like 12-15 attacks in that period, some can do hit in, and in this very short period u can heal from life tap like 300 hp in total. I don't think this is a great advantage.