An ascender is a type of beastie in the Metal Shadow universe. Ascenders are generally titanic, original monsters that resemble the stuff of nightmares. They are rare, but powerful. Civilizations have fallen from a single ascender's rampage.
The Sixth-Seventh conflict sparked because the Seventh Sky believed the Sixth had been directing ascenders in its direction. Recently, the ascender known as "ANGEL" was spotted on Sixth Sky grounds. It is the first in two decades.