Blessing of Dionysus

when you hit someone with a melee weapon, the target has to roll a con save vs 8+your proficiency bonus+your Con.  If they fail, they have the poisoned condition until the end of your next turn. While you have the poisoned condition, you gain +2 to your AC, +1 to hit, +1 to damage, +1 to all saves and skill checks, and you ignore the negative effects of the poisoned condition. When you do not have the poisoned condition, you have -2 to your AC, -1 to hit, -1 to damage, -1 to all saves and skill checks.

You also get access to the ability to cast certain spells at certain levels using the mental stat of their choosing for their spell casting modifier. You can cast each only once per long rest.

3: Crown of Madness

5: Summon Fey

7: Polymorph

9: Animate Objects