This might apply to Raine? She's a half-elf white mage. In her canon it means she's using a type of life energy (mana) for her spells.
Ankh: ... Haha. Oh boy. UH... THE SOUL THING MIGHT BE COMPLICATED? He was created from alchemy and is an embodiment of human desire. This covers most of the stuff about his abilities and what he is. His three core medals contain the characteristics of hawks, peacocks, and condors. Canon also compares core medals to how a stick is needed for a popsicle to stay together. The whole thing about being a Greeed is feeling like you have a void within you that might never be filled up. Just give me a heads up if something's about to happen. o/
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Ankh: ... Haha. Oh boy. UH... THE SOUL THING MIGHT BE COMPLICATED? He was created from alchemy and is an embodiment of human desire. This covers most of the stuff about his abilities and what he is. His three core medals contain the characteristics of hawks, peacocks, and condors. Canon also compares core medals to how a stick is needed for a popsicle to stay together. The whole thing about being a Greeed is feeling like you have a void within you that might never be filled up. Just give me a heads up if something's about to happen. o/