Axeman Universe — A Universe from the Mind of Shaddoth

Shaddoth's masterpiece "Axeman" introduced us to a whole universe, similar to our own but suddenly beset by 'portals' that allow some adventurers -though not all- to enter, fight the monsters on the other side, gain experience and loot, and grow personally just like the characters in an RPG (Role-playing Game, not Rocket-Propelled Grenade). Sometimes the inhabitants come through and treat Earth like a dungeon to loot...