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

Constricting Hold

FEAT 8
EIDOLONEVOLUTIONSUMMONER
Activity 1 action
Requirements Your eidolon has a creature Grabbed or Restrained.

Your eidolon constricts the creature, dealing bludgeoning damage equal to your eidolon's level plus their Strength modifier, with a basic Fortitude save against your spell DC.

Pathfinder Impossible MagicORC