Harvesters are not the only hostile aliens filling the dark corners of the galxy. the Alien 07040251 Hunter class, for example, is a lithe yet massively strong lifeform. Usually found in hive structures on unconquered planets, they can sometimes become stowaways on FTL ships transporting warriors or even civilians between Death Fields arenas.
In these situations, the hunters can reproduce by themselves, secreting egg-like incubation pods from their whip-like tails.
