I think we could do both, honestly, we've had suggestions for both. And I've suggested an original race as well so yeah. ^^;

For carnivorous, are we going full-on obligate carnivores (they can't actually eat vegetable matter), or just cultural reasons because there's no plants around for them to eat?

For humans, to get away from the whole 'pastiche of Medieval France and England' thing that tends to dominate, we could always look at the Mediterranean. If high elves were Roman for some reason or other, then that could imply cultural spread or association in the past, should humans derive more from late-medieval to Renaissance Italy, or the ERE. Though it could also be interesting to borrow from the Middle East, since that's a lot of medieval history that's rarely remarked upon... or, hell, go further east.

And now I'm wondering if we should borrow from steppe nomads. HORSEPEOPLE. Or sheep. Majestic battle-sheep.

I think we should have multiple human civilizations. Because I like the standard "medieval western European" thing, but it also means we can have other ones.

Majestic battle-sheep.

Also, since we're doing high magic(that seems to be the consensus at least), the mecha could probably be powered by using magical means. Airships would probably use balloons made of various materials. Or floating rocks or something.

And, um, I have a few ideas to suggest in regards to some stuff.

First off, um, if anyone actually likes the whole "Inverted Black Tower" thing, it would now be called Edes Athran. It's on its own plane of existence, and in spite of it being an upside-down massive black tower, it's still incredibly malevolent and projects this malevolence onto the living world. It has no mind or thoughts or anything at all, but it's so evil that it casts a shadow into the living world. We'd have to work out what it actually does if anyone likes this idea but yeah.

Secondly, I have a deity to suggest! Her name is Ila-Nem, which is a contraction of Ila-Zenniso-Netuyem, and she is the night goddess(and chief deity) for a race of desert-dwelling humanoids. According to their creation myth, she brought down starlight and forged it into flesh and bone to create them. They are the Nem, who are a nocturnal race that resembles humans. They are extremely pale due to being nocturnal, with slightly-larger-than-most-human's, expressive red or yellow eyes and black hair. They're also very small at 3'4 to 3'5 as adults.

For carnivorous, are we going full-on obligate carnivores (they can't actually eat vegetable matter), or just cultural reasons because there's no plants around for them to eat?

I think we should have multiple human civilizations. Because I like the standard "medieval western European" thing, but it also means we can have other ones.