Mergeworld 1

Two college friends wake up to their city under attack by hordes of ravening monsters. An interdimensional cataclysm jumbles half of Urth with half of a magical world called Tharanor. After the Merge, both mixed-up dimensions plunge into Chaos. On Urth/Tharanor, medieval buff David Pritchard battles to help lead the defense of the city...when he's not chasing after the hot new wizard girl in town. On Tharanor/Urth, wild west maven Mason Tyler and his shooting gear fall into a lake of Wild Magic. He rises up, in a reality where guns don't work...but now his pistols shoot magic. Both Technology and Magic are disrupted. Humanity must knight and cowboy up to fight and survive... Mergeworld