One day, six towers appear on Earth. Each one stands hundreds of stories tall, and are invulnerable to all attacks. At the base of each tower is a portal, welcoming in all who dare enter it. All sorts of magical monsters can be found inside the towers. Even treasure, magic, and superhuman strength can be acquired.

The problem is that the towers aren't a friendly place. Even worse, the towers sometimes release waves of monsters to attack Earth. In the year 2083, there are only a hundred survivors. In one last attempt, they challenge the final floor without regard for their lives. By some miracle, they manage to beat the floor at the cost of their lives, leaving only one survivor. As a reward for clearing the tower, he is granted one wish. He decides to go back in time to before the towers arrived. His goal is simple: prevent humanity from being wiped out.

In the apocalypse, the first weapon he’ll have to upgrade is himself.

The end of the world as we know it couldn’t come at a worse time for Adrian.

One minute, he’s an operations manager who’s overseeing a construction job in the wilderness. The next, an unknown energy force changes the very nature of life itself, from the smallest organism to the top of the food chain. The earth’s surviving inhabitants, its environment, and the very laws of physics have all undergone fundamental transformations.

Many of those changes aren’t pretty. Plenty of them are deadly.

Luckily for Earth, this has happened to other species before, and everyone receives an interface that survivors of similar events have used to navigate through an alien landscape.

Adrian’s going to need every advantage he can get. He’s stranded in the middle of nowhere, there are days, maybe weeks of travel between him and his family, and in a world full of monsters and mayhem, survival means beating the learning curve…