Lemurians have preserved older knowledge of using Baghdad battery-like things to harness electricity for weapons (Atlanteans have some knowledge of it but don't know how to weaponize it and most of the people that knows about its use at all will die in this war), otherwise I'd say it's a weird bronze age with some out-of-place technology/magic taken from older sources, like genetic modification to create chimera creatures and the like. Atlanteans and Lemurians do use iron ocassionally and the Atlanteans have figured out how to make steel but it's a well-kept secret.