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I think something that'd help (especially me) would be some kind of visual indicator that the enemy is vulnerable. Maybe a icon below their health bar or a broken shield floating above their head (kind of like the blue crown indicating targets that will give hunting quests) for the duration of the vulnerability.
If players figuring it out remains an issue, maybe work it into the tutorial on the starter island?
Well there is an icon floating above their head. But maybe not a great indicator like some have said.
I think vulnerable is fine but if considering a change defenseless might work too. In the description it could list damage against an any enemy that is defending the attack versus one that is defenseless.
As others have mentioned I think it would be useful to have some sort of indicator for abilities that have this type of damage.
It would be sorta neat if hitting a Vulnerable enemy with an appropriate skill popped up some "Vulnerability Exploited!" text or even caused the screen to shake a tiny bit (monkey's paw curls).