Depends how you define them really. Off the top of my head...
Undeath/Nehekara, Vampires, Great Maw, Little and Big Waaagh, and the Wild (beastmen).
Lore of the Serpent may also apply depending on your lizardmen interpretation, and more specifically, your view on Sotek.
Lore of the Wyld definitely counts, it's Dhar/Chaos-flavored-Ghur. You could almost consider it an equivalent of Necromancy or Stealth, being a Wind-specific lore tainted by Dark Magic. That said I'm pretty sure you have to be a beastman to use it. Not that it would exactly bar Mathilde from using it, but generally people do not go out of their way to become beastmen.