The world of CthulhuTech is a world that is slowly going to proverbial hell in a hand basket. It all began somewhere around the 2000's. Alien invasions, Old Ones being called up, shadow conspiracies. Humanity still fights, but it is losing. The Aeon War has nearly crippled the world, driving humanity into major cities that are turned into fortresses called Arcologies. The humans have allies in their newfound genetic brothers, the Nazzadi, but that has only bought time for them.
On one front, giant mecha battle alien invaders for control of the world.
And secretly, monsters battle monsters for control of human kind.
All of these have end games coming, ones that may be as soon as the next day in an attempt to control the universe... or just survive the apocalypse.