Cauldron Lord Soulwrath's key disintegrates as it touches the lock on the access panel at the base of the cauldron's platform. A slight clanking noise is heard within, and the access panel swings open to reveal more viscous toxins within the cauldron's framework.$b$bThere is a small spigot that the bottle fits well enough under, allowing you to draw a sample for Shadow Priestess Vandis back at the Bulwark.