I am sorry to just open a topic for discussing this.
I just wonder is there any effect like stun, unbalance, blind etc that may affect bosses?
I know stun won’t, what about other?
I believe you can stun bosses with Arrest. Otherwise, no stun, freeze, or other CC effects will affect bosses.
Things like bleed, Lethargy, and other debuffs of those kind should work.