"A girlish little punk, a big freaking bastard, a bag of bones with a pointed head, and a hunchback—you pricks wouldn't happen to be the Fiend Corps would you?"
Frontier Defense Force[src]

The Fiend Corps are a bandit gang that had terrorized the northern part of the frontier. They struck a deal with Magnus Lee, to get rid of D.

They where posing as Behemoth Hunters.