Reanimated Corpses

Reanimated Corpses of humans killed by Reapers, now part of the Martian Horde. They are slower, but faster and more powerful. REanimated Corpses, like Revenants, can be summoned simply with Knowledge whereso applicable, and are trained almost instantaneously.
It pays to know that Reapers and Reanimated Corpses are available from the same building at the same time, and at the same tech level: Area Denial, Subliminal Messaging are required to create both of them.