Clan Mordkin was one of the many Warlord Clans to fight against the Undead legions of Nagash. Inspired by the fearsome sight of the walking dead, and wishing to intimidate any rivals, the Skaven of Clan Mordkin took to adorning themselves with the bones of their foes. Many of the Skaven dyed patches of their fur or else painted their clothing and armour white to resemble skeletons. Even the fur of the clan's Giant Rats and Rat Ogres are dyed to give them a more deathly appearance. To this day, the Skaven of Clan Mordkin remain obsessed with death. They are instantly recognisable for their fearsome appearance and they still frequently incorporate bones and skulls into their armour. Shields, banners and totems are likewise adorned and many of the clan's warriors carry daggers carved from bone.
Many Chieftains and Stormvermin of Clan Mordkin wear a helmet made from the skull of a Giant Rat or even a Rat Ogre. Both the image of a bleached Skaven-skull and the Rune of the Great Horned Rat constructed from gnawed thigh-bones are common symbols of Clan Mordkin.