Carefully bred over a decade of trial and error, Igor was grown in a tank by Chaos Dwarf wizards to create the perfect Blood Bowl player. When they believed they had perfected the formulae, they signed him over to the next Chaos Dwarf team leaving for other lands.
The Industrial Revolution found his infinite aggression and strength to be most useful, although his impetuousness has cost them a few touchdowns. But they don't mind, as long as he keeps the casualties rolling in....