Because of this, the other Super Mutants, imprisoned Fawkes. Unlike other mutants, however, Delacroix/Fawkes was not driven insane by the transformation, though he slowly lost all memories over the 200 years he was trapped in the Vault.
Delacroix mutated into a roughly 8-foot tall, 800 point, yellow-skinned monstrosity which would later become colloquially known as a ' Super Mutant'. Fawkes may have formerly been a Vault security officer named Sheldon Delacroix, who discovered the dark secrets behind the Vault and was subsequently captured and used as a test subject.
Fawkes was, like many of the residents of Vault 87, exposed to the Forced Evolutionary Virus in part of the twisted experiment which was the true purposes of the bunker's construction in the 2060s (rather than as a shelter in case of a nuclear war, as the public were informed). Fawkes is a major character and possible companion to Lone Wanderer in Fallout 3.