Wraiths are the general term for Cybernetic Combat Units (CCUs).
In Arena Edit
Wraiths stand around nine feet tall, weigh around 3,000 pounds and are the toughest and slowest units in the game, whereas the fastest and lightest are the Brutes, and the median being the Juggernauts. The leader unit of their racial team is Odin.
All Wraiths in Arena are named after Norse gods, goddesses and locations.