the weakest would be ignored or overwritten. with the exception of poison and continuous heal, buffs and debuffs are unable to stack.

Reflection is, by the way, only the second best strategy to kill the FK. In higher dungeon levels, he hits to hard and will smash team members with low hp/def.

Better, to get his shield depleted only once with multi hitters fast and keep it down with turnmeter reduction. Armiger, Visix, Coldheart, Alure, champs like that.