Though the ordinal energy inherent in bones is neutral in nature, its frequent use among necromagi, necromancers, and other consorters with the undead has it associated with Kael'Ras and the undead. The energy itself is wielded in one's own body, in another's body, or from dead bones. The latter is undeath-related.

Tulang, the art of stretching one's own bones, strengthening, lengthening, or otherwise empowering them

Os, the art of sympathetically snapping or moving the bones of another person, usually using a stick or similar object

Raesian Dust, the art of invoking the bones through grinding them to dust, which can then be used to curse someone to undeath