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

Healing Nexus

FEAT 8
Activity 1 action
Archetype Living Nexus

Frequency once per 10 minutes
Requirements You are overflowing.

You metabolize some of the magic you absorb into your internal nexus to stitch together any wounds on the rest of your body. You heal (the item's level ÷ 2, rounded down) × 5 + 10 healing Hit Points. At 10th level and every 2 levels thereafter, the amount of healing increases by 5. You are no longer overflowing.

Pathfinder Impossible MagicORC