Invincible Monsters

I recently fought a Banshee and my Rank 1 Wings of Rage did 1 damage, both the explosion and the residual damage. I have a feeling that all the invulnerable monsters are more invulnerable than we thought. I can test it on the Arc Lich later, but I'm too lazy to try to run Peaca Normal for the Demi Lich too.

Did arc lich less than a month ago wings worked fine. ONLY residual will do damage. But haven't tested recently.

So would Longa bosses be affected by WoR as well?

Does dragons count? And will it stun lock dragons?