Unstable Psionic Surge

You fire a blast of unstable mind energy, that sunders a targets brain, just as much as your own. Target a creature within 100 feet of you, that you can see, the targeted creature must make an intelligence saving throw. on failure, the creature takes 1d12 psychic damage. 

On the beginning of your next turn, you will take half the damage of the outcome of the roll (rounded up) in poison damage. this self-damage ignores resistances and immunities.

This spell's damage increases by 1d12 when you reach 5th level (2d12), 11th level (3d12), and level 17th level (4d12).