pf2e.fyi
From Pathfinder Book of the Dead, which isn't enabled.

Greater Deathly Secrets

FEAT 10
ARCHETYPE
Archetype Reanimator
Prerequisites Deathly Secrets

Your undead secrets grow stronger still. You learn either the Malignant Sustenance or Grasping Grave focus spell. Your focus pool increases by 1 point.

Special You can select this feat more than once. Each time, you learn a different spell and your focus pool increases by 1 Focus Point.
Pathfinder Book of the DeadOGL