Abilities after illusion
 

what happens with berserk bonus if i use it in a battle (+1), and then someone play an illusion (change the monster)

what happens with cleric ability (+3) if i use it versus a death monster, and then someone change the monster with an illusion? is it important if the new monster is a death monster or not? if new monster is not a death monster, then ability bonus wouldnt be valid? perhaps bonus is losed if monster is changed? and, in this case, could i use another time his ability?