The Gold Purge Crystal seems to fit perfectly!
You touch the now glowing crystal and feel empowered by its energy.
You have gained knowledge of the 'Purge Vial' skill.
Kill Forest Rat to get 8 Yellow Purge Crystal
*Kill Goblin to get 8 Blue Purge Crystal
*Kill Lynx to get 8 Red Purge Crystal
*Mix 4 times each
**1 Blue and 1 Yellow into 1 Green Purge Crystal
**1 Blue and 1 Red into 1 Purple Purge Crystal
**1 Yellow and 1 Red into 1 Orange Purge Crystal
*Forge 4 times each
**1 Green, 1 Purple and 1 Orange into 1 Bronze Purge Crystal
*Mix 2 times each
**2 Bronze into 1 Silver Purge Crystal
*Mix 2 Silver into 1 Gold Purge Crystal
*Start quest Purge Chamber
*Place Gold Purge Crystal
*Receive Purge Vial Skill
*Turn in quest