The Scarak are found in Zone 2, the Howling Sands. They occupy hives and have multiple different variants to encounter. Much like ants in the real world, Scaraks have workers, warriors, and a queen at the center of it all.
Scaraks used to enslave Ferans, until they broke free. The details of how or why are as yet unknown. We do know that Ferans took to wearing their shackles, now known as 'Freedom Bracers' as a symbol of their new-found freedom from slavery.