There are those who craft bombs. Alchemical weapons that can be used for combative purposes.

[ Yet the Continent is not one that has reached a certain age of development, or even the need for evolved weapons when there are many content to make use of swords, axes, maces, or even the occasional dagger. Yennefer has made a habit of keeping the latter on her person when she thinks she'll be in need of it, though it hadn't been in her possession upon arrival. ]

Does your world require significant use of those things?