since he has the Masamune in Lords of Shadow 2(which isn't exactly great, honestly), and the Crissaegrim is made from a piece of the Vampire Killer that was melted down and infused in the blade(along with a flaming demon sword and a magical ice sword), which makes it the most overpowered weapon in the game.
it doesn't god mod. Just think of it as a combination between the Void Sword and the Chaos Claws, just a little bit hotter and with better health regen per attack.