As an action, you siphon the souls of surrounding creatures. Each creature other than you in a sphere centered on 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.
You can expend 1 additional mana or psi so you continuously siphon souls around you. The duration changes to 1 minute/mana, concentration and the death field remains around you in an aura shaped as a sphere. Until the spell ends, the aura moves with you, centered on you.
Whenever a creature enters the area for the first time on a turn or starts its turn there, it must make the Fortitude saving throw. The damage is reduced to 2d6 and additional augments to the damage increase the damage by 1d6 for each additional mana or psi expended, instead of the normal increase.