Omniscience is a part of the Psyche Aspect of the Divine Fysa.
This can be either an active or passive fysa. The user can see the past or future, and has many forms depending on the individual-- the future can be discerned from dreams, the stars, read from omens, or determined through cards, colors, leaves, bones, charms... the list goes on. Divination tends to be uncertain, and serve as possible futures rather than the one and only true future.
Those with this ability also have an uncanny sense of time.
This ability also costs an odd tune in addition to other learning costs. Rrex with their default halo ability can give up their halo to forgo this cost ONCE.