From Pathfinder Advanced Player's Guide, which isn't enabled.

Enervation

SPELL 4

Traditions arcane, divine, occult

Cast

Area 30-foot line

Defense Fortitude

Extending a finger, you fire a beam of void energy that weakens the life force of any creature it touches. Each living creature in the line must attempt a Fortitude save.

Critical Success The creature is unaffected.

Success The creature takes (rank ÷ 2, rounded down)d8 persistent void damage.

Failure The creature takes ((rank ÷ 2, rounded down) × 2)d8 persistent void damage and becomes Drained 1.

Critical Failure The creature takes ((rank ÷ 2, rounded down) × 2)d8 persistent void damage and becomes Drained 2 and Doomed 1.

Heightened (+2) The persistent void damage increases by 1d8 on a success, or by 2d8 on a failure or critical failure.

Pathfinder Advanced Player's GuideOGL