Revenant (Forgotten Heroes, Book Four)

The game is over. The real war is about to begin.

Hayden and Caleb face their greatest challenge yet: building an alliance across the multiverse itself. Different timelines. Different realities. Different versions of friends and enemies alike.

But assembling an army is only the first step. The true enemy has existed since before humanity crawled from the primordial ooze—and they don't intend to fall without a fight.

The Relyeh have ruled the multiverse for eons.

It's time someone challenged their reign.