Most dragons dies during the apocalypse. Its unknown if they’re deaths where a result of nukes, biological, chemical or conventional weapons. Its possible the mana storms placed them in a torpor similar to the one in chicago many years ago.
however, the few known survivors no longer consider (meta)humanity a play thing, but an enemy. For once a real threat who could wipe the planet clean again. Generaly, they use magic and armys to assault humanity, often tricking human against human. The kingdoms they have carved out are ruled by iorn fists and mostly kept low tech.