I think a benign possessed weapon with primal-esque characteristics could be worked into the setting, despite the lack of precedent. We know spirits and voidsent exist, that they can possess people, and that it is possible to use your own aether, rather than the aether of the land, to enact magic. So perhaps a primal-like creature could be summoned out of people's grudge in the same manner as Moogle Mog. Maybe just a few crystals were used, and rather than feeding off the aether of the land, it feeds off the aether of the weapon-holder. So it would work like Odin, but not necessarily be a full on Primal. Thus after a while, the lalafell primal's host dies or must give up the weapon from exhaustion, and Memenu becomes dormant again. I don't think it sounds too far fetched.
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AV by Kura-Ou
Wiki (Last updated 01/16)
My Balmung profile.
AV by Kura-Ou
Wiki (Last updated 01/16)
My Balmung profile.