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 Antagarich, managing to wipe out Tatalia almost entirely and bringing about The Reckoning by clashing the sword against Gelu's Armageddon's Blade.
It is mentioned in The Sword of Frost campaign from Heroes Chronicles.