As an action, you siphon the souls of surrounding creatures. Each creature in a sphere around you must make a Fortitude saving throw.
On a failed save, a creature takes 2d8 necrotic damage.
On a successful save, a creature takes half as much damage. You regain health equal to half the amount of necrotic damage dealt.
You can increase the damage by 2d8 for each additional mana or psi expended.