Well... I tested Hypnos third ability and it was... very strange.

First of all the info in enemy said that it will do nothing for 180 sec or after reciving X damage, but nothing like def down. And when I attack the enemy on the next turn it simply said nothing. the Debuff just dissapear. I guess I just deal enougth damage to break the debuff but... What exactly does it in the first place? Go to sleep the boss until I wake him up?

I think the description in her wiki makes a mistake in this ability.