Right, so uh..

You've been entrusted to be a paladin for this blood mage, unfortunately for you, he seems to be crazy.

World overview: Andrum

So basically, it's a normal fantasy world, but then there's this portal who makes people from otherworlds drift, whether from earth or nah. But.. there's also other kinds of portal, with some sick ass monster who came to destroy Andrum, think of them similar to Grimm from RWBY.