The Mojo

As charismatic as you can be, you approach a creature you can see within the 10ft range and ask him the question "What are you vulnerable against?". The creature in question must make a Wisdom saving throw against your Spell Save DC. If he fails the throw, he must tell you what he is vulnerable to and takes 2D10 psychic damage . If he succeeds he can decide to not tell you or to lie about it and takes no damage. A creature on whom this spell fails on is immune to your charm for 24 hours. A creature who is immune to being charmed, this spell has no effect on him.