Originally Posted by
Pixel_Kitsune
A lot of things fly via magic but the wings might be where the magic is. Like Dragons do NOT have the wingspan to hold themselves and it's addressed in 2nd Ed and I believe in the Draconomicon in 3.X. The wings are where the magic around their flight is, so you can damage wings and ground them, but they're not just using aerodynamics and physics.
As for Primus. Primus is on par with a greater deity with some variances. We're talking at least on the level with Thor and Redcloak's god to grab from the source in question.
A Greater deity relies on mortal faith and is tied to it. Their own domain and the material world where their followers are. Primus, or the other head exemplars (examples: Asmodeus, Zaphkiel, Talisid, The Oinoloth, Morwel, etc) Are the pinnacle of what they are. They have the power of deities, People pray to them and get spells, though it's the concept they embody that grants the power. The Primus IS mortal, it dies periodically, a Secundus replaces it and so on down the line.
It was actually a major plot point in 2nd Edition, Orcus was killed, became a deity, killed a Primus and became Primus for a time in order to regain its life. BUT, Orcus is also a Demon Prince on par with Primus, Asmodeus, etc from the get go, so...