The Evil Eyes are identical to the Eyes of a regular Rune Cannon. However, while the Eyes of a typical Rune Cannon are normally closed, The Evil Eye, on the other hand, is always open and can be readily controlled. It projects a sphere wherein people are transformed into monsters.
The potential for such a weapon, if the secrets of "opening" the Eye of a Rune Cannon could be found, was so great that the year 309 saw of group of adventurers aiming to destroy the last trace of Rune Cannons, their numbers having greatly diminished with the destruction of the Giant Tree at the end of the Island Liberation War.
The last surviving Evil Eye, obtained by Iskas who had it forcibly removed from a monster's eye socket, was destroyed by Kyril, ending the use of Rune Cannons in warfare, as by this time nearly every supply of muzzles and ammunition had been destroyed.