You've just made me realize how much of an oversight I've made when I wrote the pitch for the game.
This is meant to be a completely high fantasy game, no modern character/technology/world involved. The world before the portal was opened was populated by elves, dwarves, humans, halflings and so on. They lived in a fragile peace, but then someone opened the portal by accident and creatures that were never seen before came pouring in, evil and bent on claiming that new world for their own...