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 High Priestess MacDonnell back at Chillwind Point.