- Rare drop from Wyverns.
- Guaranteed drop from Hydras and Undead Dragons.
- Found in a chest in lower Blighttown, near the bonfire.
- Found on several corpses in Ash Lake.
- Reward for winning PvP as or against a member of the Path of the Dragon covenant.
- One per playthrough can be obtained by trading an Egg Vermifuge to Snuggly the Crow.