So basically:
-In the Nexus, there are these free roaming entities I’m calling power wisps. They are ghost-like in nature, but they need food and stuff like any living thing
-While they can survive on their own, they generally find it difficult to live in the harsh environment of the Nexus
-Power wisps are known to radiate tons of energy, and often have reality-warping effects on their surroundings
-Power wisps can find shelter within other entities, forming a symbiotic relationship. The host feeds and shelters the wisps, and the wisps provide magic and extra energy in return
-Any being can form a bond with power wisps, even those not native to the Nexus.