Oblivion Rituals
Must have a level of Oblivion equal to the level of ritual you want to learn.
Oblivion rituals are grouped into three broad categories. Necromancy, Abyss Mysticism and Thantomancy. Necromancy deals with ghosts, zombies and raising the undead. Abyss Mysticism deals with the cold, uncaring sentient darkness of the Abyss. Thantomancy deal with alterations to the soul. These distinctions are represent different schools of oblivion usage but are not limitations. Necromancy is most common among the clans of death ( all those descended of the giovanni, and Abyss Mysticism is most common among the Lasombra, but theres nothing stopping either from pursuing rituals from any of the three.
Necromancy (Giovanni)
Abyss Mysticism (Lasombra)
Thantomancy (other - Kiyasid??)