Technology

The technological level of the Aegeron varies between real life late medieval and early Renaissance (not counting magic of course).

Wizards and inventors
"Science" is practiced by two wildly different type of people: wizards and inventors. Wizards (most of them are humans and elves) mostly care about exploring new spells (and empowering and enriching themselves) and often ignore the rigor of the real-life scientific method. The other group is the inventors (mostly gnomes and dwarves), these enthusiasts often have no talent for magic and try to make up for that with sheer ingenuity. Their inventions often use clockwork and steam parts, usually augmented with some kind of magical artifact they encountered. This leads to the creation of some wondrous and bizarre inventions (e.g. airships, clockwork golems, steamships) but they are just too complex and expensive to be mass produced (e.g. there may be about two dozen airships in the entire continent).

What is true for both wizards and inventors is that they jealously guard their secrets, which has greatly hindered scientific advances  (the technological level of the continent barely increased in the last 400 years). The Imperium tried to force both groups to share their secrets and sometimes minimal cooperation was achieved that led to great advances (e.g. see imperial cannons later).

Weapons technology
Late medieval equipment is widely available (crossbows, plate mail) and gunpowder based weapons exist too (cannons, muskets, arquebuses) but they are very expensive. Armies of wealthy realms often have access to cannons. The science of cannons is very basic in this world, so the cannons they cast are extremely inaccurate and very expensive to use. It is possible to infuse the chambers and shells of cannons with magic, creating precise and extremely devastating artillery. The secret of doing so, however, has been lost during the fall of the Imperium, only the dwarves of Btharmaz know the secret now and they are all bound in service to the Dwarven Dominion. This is why other realms use old imperial cannons (there are still quite a few around, although they are very expensive) which work just as well with mundane cannon shells and are superior to the dwarven cannons in all respect (but not even the dwarves know how to make those any more). For example Stoneharbor is a rich merchant city so it has imperial cannons on several of its battlements and many of its ships have these cannons too.

Handheld gunpowder weapons are considered rare and exotic weapons, mainly because of how expensive it is to maintain one (still, one should be able to buy one if they looked hard enough). They were either made for rich nobles or crafted for personal use by inventors