With a flare of brilliant octarine light, each creature within a 10-foot-radius sphere centred on a point you can see within range must succeed on a Charisma saving throw or become soulbound for the duration, its magical essence tied to its physical (or incorporeal) form. If a creature dies while soulbound, its magic is bound to its components for 24 hours allowing harvesting to start at any time within this period (see page 87 for the rules on harvesting). Once harvesting starts on a corpse under the effect of this spell, the spell ends for that corpse. Creatures possessing robust or more powerful essence (typically, those of CR 7 or higher) automatically succeed on this saving throw.