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

Ectoplasmic Aura

FEAT 18
Activity 1 action

For the next 10 minutes, you and all allies in a 30-foot emanation from you gain a +1 circumstance bonus to AC as the air between you and your enemies thickens with ectoplasm. Additionally, any enemy that ends its turn in this aura must attempt a Fortitude saving throw against your spell DC. On a failure, it can't use reactions until the start of its next turn. You can Dismiss this aura.

Pathfinder Impossible MagicORC