The kind from my own world that Nightsisters are able to wield. Technically, Nightbrothers are not supposed to learn about it, but I think my mother would have taught me eventually had I stayed on Dathomir with her.

[Talzin had already broken a lot of traditions that were in place regarding how Nightbrothers were supposed to be treated when it came to her eldest son and she'd been well-aware he was Force-sensitive. Maul has every reason to believe she meant for him to be her heir in regards to her wisdom and knowledge.]