Eclipse of the Eternal Flame. The Primal Chronicles, #3

The light of the world is fading, and this time, the darkness is coming for the source. The Shadow's corruption has reached the elemental realms, and the Ember Peaks-the last sanctuary of the Eternal Flame-are under siege. Ryn, Thane, Mira, and Korr have survived the descent into the ancient world, but the stakes have shifted. They are no longer just fighting for survival; they are fighting to preserve the very essence of life itself.
As Ryn grapples with the terrifying weight of her burgeoning immortality, she realizes that the Heartstone's power is tied to the Flame in ways she never imagined. But the journey to the peaks is fraught with more than just monsters. Inside the fellowship, a new life has emerged: Mira and Korr's infant son. Protecting a child in a world defined by Ash, Ember, and Endings creates a vulnerability the Shadow is eager to exploit.
With shifting loyalties and an ancient prophecy coming to light, the group must decide what they are willing to sacrifice. To reignite the flame, one of them may have to become the fuel. The eclipse is coming. The fire is dying. And the end of the world has a name.