From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Quenching

ITEM 6

Price 250 gp

Usage etched onto armor

Bulk —

This rune counters burning and corrosive agents. Armor with this rune reduces the DC of the flat check to end persistent acid or fire damage affecting you from 15 to 12 (7 with particularly effective assistance).

Pathfinder Treasure Vault (Remastered)ORC