In Excustoria, space-dust has Magical powers; it grants sentient (and occcasionally non-sentient) creatures the power to will creatures (potentially including themselves) to mutate. Space-dust is only present and active in sufficient quantities to affect anything during rare meteor showers, which happen in 205 (or some similar number) year cycles, and even then usually only a handful of survivable mutations occur.
These space-dust fueled willed mutations are occasionally useful (see Fast-Wheat), but more often destructive (see Wild-Wheat) or deadly (see Vitures). Mutations have occasionally wiped out entire ecosystems.
So far as we know, no other magic exists in Excustoria.