From the back cover:
The world as we know it has ended. Rending storms are ravaging an arid wasteland, and the last remaining populace took shelter in the OASys, a manmade dome of steel and neon lights. With resources dwindling they turned to the occult and infused technology with eldritch power, just for the machines to awaken, revolt against their makers, and change flora and fauna under its influence
It’s time to suit up and wield those same ruinous powers to reclaim a chance of survival.
Eldritch Sands is a unique and deadly campaign setting for 5th Edition of the world’s greatest roleplaying game, putting you in control of powerful suits called Eldritchtech to face the perils of a dying world. Shape the future by aligning with one of four factions. What will you do when you discover their secrets? Face dangers in and outside the OASys of a world heavily influenced by ‘70s and ‘80s science fiction and horror.