From Pathfinder Lost Omens Impossible Lands, which isn't enabled.

Venomshield Nagaji

HERITAGE

Ancestry Nagaji

Your intrinsic connection to nagas and mundane serpents grants you an innate resistance to toxins of every sort. You gain resistance to poison equal to half your level (minimum 1 resistance), and you gain a +1 circumstance bonus to all saving throws against poison.

Pathfinder Lost Omens Impossible LandsOGL