[@KabenSaal]

Looks okay so far. The composite consciousness has precedent here (see Vestec to a lesser degree, and Gadar-Belruarc-Vowzra for the greatest extreme), which works in your favour. Having some more actual elemental gods around would also be nice, since we lack those (we have Zephyrion, and I think that's it).

As for your origin, one idea that comes to mind for the source of divinity is Aihtiraq, the wish-granting djinni of magic who is also one third of Zephyrion. This, I feel, is perhaps the most plausible and least contrived divine 'parent' (although not set in stone. If Aihtiraq doesn't work, we can find another way).

Otherwise, my main question for now is the same as Mutton's: what are your initial plans once Legio is created?