Sons of Fenris [ULRIK]

The Wulfen are the most drastic departure from a normal Space Wolf. The Space Marines who mutate into Wulfen bear resemblance to werewolves in the same way as Blood Angels suffering the Red Thirst resemble vampires. Any marine to suffer as a Wulfen becomes a half man, half wolf creature with a feral mind. The mutation normally manifests itself in the neophyte stage and Space Wolves must spend time in their training in a scenario designed to out those who have become Wulfen.

Though normal Space Wolves sometimes use individual Wulfen in battle, the 13th Company use entire packs. Each and every member of the 13th Company carries the Curse, and it manifests itself in the Space Wolves at different times. Thus even the Wulfen packs do not stay the same. It has manifested itself so strongly and so late because it reacts to the influence of Chaos; because of this side of their nature acting as a kind of spiritual defence mechanism, Space Wolves are exceptionally resistant to the malign influence of Chaos. It is believed that the 13th Company have only been able to survive living as loyalist marines in the Eye of terror so long precisely because of this trait.