The evening at Tin Lizzie's
Nicky scoops it up and mumbles: "terminal mana corruption, not only incurable, but it's also messy and painful..." he pours it onto the tub floor as he remembers that he threw up at one point and stands to look at the new changes.
Light Bane: Chapter 36
Fenrir could see he was trying to dominate the plant, but he was losing due to the overwhelming black mana corruption and the ancient magic stockpiled by the tree.