Maxel

"Consider Loktar. Here on Goth, lies a treasure trove. Weapons unmatche even after two centuries. Devices that should shatter suns; that could halt planets in their orbit. Imagine that power in the hands of the Cybermen."

Maxel discussing matters with Loktar

Cyberleader Maxel was the leader of a Cyberforce that landed on the Planet Goth to find the weapons of the Deathsmith's. He was the only survivor and challenged the Apocalypse Device. He tried every weapon that he collected against it, but it was no use, the Apocalypse Device was indestructable. He ran back to the ship and killed himself by activating the ships self destruct mechanism. (http://tardis.wikia.com/wiki/Black_Legacy)