Thanurgenic Inversion

Due to to the spell's unstable nature, perfection on casting will come with time. Roll 1d20 + your proficiency modifier. The CR of this spell starts at 22.

On a success, the movements of casting become more natural and the CR of this spell permanently lowers by 1. Power flows down your arm:
You create a gossamer, bony hand that appears to encase your own. A creature you touch feels icy energy race through them, regaining hit points equal to 1d8 + your spellcasting ability modifier.