Wallop's transformations were once difficult to control. By increasing his strength too much, he would mutate further into a form with tusk-like teeth, a flaming mane of hair, and a berserker rage rivaling Wolverine. It also took a great deal more time to reverse the transformations than to initiate them. Walter has since overcome these difficulties. Like all his family, Walter is virtually immortal and his aging process slowed to a crawl after he finished puberty. He was born sometime from the end of the 12th century to the start of the 17th.