pf2e.fyi
From Pathfinder Impossible Magic, which isn't enabled.

Consume Thrall

FREE ACTION
CONCENTRATENECROMANCEROCCULT
Activity free action
Frequency once per day
Requirements You have 0 Focus Points and at least one thrall with 30 feet of you
Effect You destroy one thrall within 30 feet of you and regain 1 Focus Point. You can spend this focus point only to cast a grave spell.
Pathfinder Impossible MagicORC