Need help with my manga!?

Im writing and drawing my own manga but have no accurate timeline, Its a more magical themed land filled with war and conflict, Im using mainly medieval warfare but at the same time there's another project going on that has a lot of genetic and bio science involved. I need a time and era. The story has a lot of mentions about genetic enhancements. The science and warfare don't really go together but there has to be a point where they can meet.