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From Pathfinder Lost Omens Rival Academies, which isn't enabled.

Tributary Circulation

FEAT 4
Activity 1 action

Never distant from water's succoring presence, your refined breathing techniques focus your awareness and control of water inward. You gain a +2 circumstance bonus to Will saves and saves against poison until the beginning of your next turn. If you spent two actions on Tributary Circulation, you can also attempt a flat check to end persistent poison damage you're suffering, reducing the DC to 10 as if you had gained the benefits of assisted recovery.

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