Orpheus

From the introduction: Orpheus is a different dimension where magic works and everyone rides horses and uses swords. In fact, it is a lot like the medieval Earth—only Orpheus is ruled by evil Trancer Lords! Worse yet, these Trancers are also vampires and will suck your life out if you are not careful. Most people do not try to mess with the Trancer Lords because they do not want to have their life forces sucked out. However, there are some brave people who will fight them: the Rebel Resistance.