When Ellron allied with the Enchanters Guild against Thaddeus Kaine on Mage 19, 924 GUE, he purchased a lethal scroll from Wizard Bilboz. This scroll may have been the one used by Ellron in the 935 battle at Flood Control Dam #678, when he turned the weapons of Kaine's army into fudge.

SOURCE(S): Zork Nemesis