From Pathfinder Impossible Magic, which isn't enabled.

Necrotic Bomb

FOCUS 1

UNCOMMON CONCENTRATE FOCUS MANIPULATE NECROMANCER VOID

Cast

Range 30 feet

Area 10-foot emanation

Targets 1 of your thralls

Defense basic Fortitude

You overload one of your thralls with void energy, causing it to explode. Each creature within a 10-foot emanation of the thrall takes 1d12 void damage with a basic Fortitude save. This destroys the thrall.

Heightened (+1) The damage increases by 1d12.

Pathfinder Impossible MagicORC