Sword of Frost
A legendary sword that matches the strength of Armageddon's Blade. It was kept in Volee by the Vori elves, but was stolen by Kija, one of Kilgor's wives, and given to her husband, in spite of Tarnum's efforts of keeping anyone away from it and Gelu's quest to take the sword. With it, Kilgor started to conquer Enroth, managing to wipe out Tatalia almost entirely and bringing the end of the planet by clashing the sword against Gelu's Armageddon's Blade.
It is mentioned in The Sword of Frost campaign from Heroes Chronicles.