Filtering Gills

Body modification, rare (requires attunement)

This augmentation allows the user to breathe both underwater and on land at will, as the water breathing spell. In addition, the wearer can extract oxygen from poisonous gasses while filtering out toxins, making him immune to inhaled poisons.

This does not protect the wearer from magical gases or vapors, nor does it allow the wearer to breathe in a vacuum.