In my fantasy setting, then there are two countries (Mapiya and Mystikicis) that are supposed to be the most magically and technologically advanced. I've already got the magical advancement more or less down, but not so much for the tech-level.
This isn't without trying: I've thought of weapons, armour, transportation, medicine, and production of constructs, yet I always feel like they're too advanced for the setting.
Just a bit of tech background for the Mystiks (people of Mystikicis), they used to have firearms and bombs, but after a massive wave of darkness and new demons in the Abyss (basically Hell), then they were able to detect that the wave was caused in some degree by firearms and bombs. They weren't entirely certain how involved the technology was, but they were able to tell that it had quite a bit of involvement. So to prevent anything similar from happening on Hraedmur (the planet they're on), they have forsaken the production of such weapons, and are purposely keeping other countries from learning such technologies exist in the first place.
tl;dr They know what firearms and bombs are, they just don't use them.
The Mapiyas live on landmasses in the sky, having been set up there through the use of a magical stony substance, by the ancient gods as a gimmicky resort for the wealthier, more pretentious gods (similar to underwater resorts in the real world). However, although they're supposed to be quite advanced, I haven't been coming up with much to show that. I've given them masks to protect their faces and breathe better during flight, but not much else.
One example of one of the less advanced nations, though more advanced than most, are the Eulimites, who have developed a primitive flamthrower using flammable oils and a match.
I've thought about using Wakanda (Marvel) as a base, but that didn't turn out well. Now I'm thinking something like the Protoss (StarCraft), wherein they infuse their tech with magic. Alternatively, I could go down a Dwemer (Elder Scrolls) route, though the Dwemer didn't use magic, seeing it as unnecessary, unlike the Mystiks who use lots of magic.
Or I could try something similar to the tech of either the Makers or Angels (Darksiders).
The main question is; How do I represent that the two countries have highly sophisticated technology while retaining a high-magic fantasy tone?