Pulse Rate: Zero

In the world of Haemathos, your blood is your weapon. But for Kaelen Cross, it feels like a death sentence.

Centuries ago, heaven blessed humanity with blood magic to fight back the Bloodless, a terrifying, insectoid army of stone and crystal that cannot bleed, sleep, or feel mercy. By accelerating their heartbeats, human mages can unleash devastating fire, lightning, and gravity. The rarer your blood type, the more powerful you are. The wealthy elite hoard these divine bloodlines behind high marble walls, while the common tiers are left to bleed out on the front lines.

Now, the peace is shattering. The Swarm King has awakened his unstoppable armies, and humanity's magic is no longer enough to pierce their evolving armor. The world is desperate for a legendary Chosen One to save them.They expect a golden god. They get Kaelen.

Frail, starving, and hiding in the lawless desert wastes, Kaelen is severely anemic and can barely stay conscious. He believes he is completely broken. But Kaelen carries Rh-null, the legendary Golden Blood-a type so rare it has no magical signature at all.

As the monsters close in, Kaelen discovers a terrifying truth: his silent blood makes him completely immune to the Enemy's lethal powers. To survive the coming apocalypse, this fragile outcast must team up with a rogue elite assassin and a selfless battle-medic to tear down the world's corrupt hierarchy and silence the swarm forever.

To save a dying world, the weakest boy alive must stop the world's pulse.