The only way from a Golden Age is down, and the planet of Anteia decended to the bottom. A 4000 year dark age of petty wars, and magical and technical stagnation left the continents in a state of decline. A prime situation for an ancient evil to reveal itself yet again.
To hold back the eventual tide of death and ruin, an enigmatic being calling itself the 'Cartographer' calls upon a man worlds apart as the vanguard that would usher in the heroes of legends to fight back against desolation itself.
Only, the man in question isn't a hero. No powers, no allies, and a defeatist attitude leaves Cameron Walker in a foreign land with people who can summon the elements, manipulate minds and bodies, and fly or turn invisible at will. Cameron has no apocalyptic magic, nor a body that can crush mountains.
He just has whatever willpower he has left.
Oh, and an arsenal of Earth's finest firearms and munitions.