Dark Ender, sometimes called Shadow Ender, is more or less Ender NightBlade, but completely corrupted by shadows and/or evil. He was a puppet under Sonake and Malladus' control, but has all the strength of Ender in a single fist. He was first encountered when Sonake came to fight Ender again and used Malladus to possess different things in order to cause havoc.
He later became his own entity, and the story continued from there
Dark Ender is a powerful boss who appeared in 0 and 1, first in a field at night, then in a city street.