Twilight of the Immortals (Aetherium, Book 7 of 7)

The dragon-possessed healer Asha joins forces with the fox witch Wren, the airship engineer Taziri, and the immortal knight Gideon to save a family of living gods from an ancient evil: the immortal Lilith.

Many heroes have gathered to defeat her, but the one person who knows her secrets is lost. And if Asha cannot control her own grief and rage, the dragon's soul within her may turn her into the most devastating monster of all.

Battles rage from the city streets to the night skies, and down into the vast necropolis hidden beneath the earth. But this is a battle that cannot be won with weapons if Asha is to also save her own sanity and bring peace to the city of the gods.

Welcome to the world of AETHERIUM, where strange machines sail the seas and the skies, enormous prehistoric beasts roam the earth, and the restless dead whisper to the living. Similar to our own world in the sixteenth century, AETHERIUM explores a reality in which many of the megafauna did not die out, including terror birds and saber-toothed cats, and in which a devastating Ice Age continues to ravage Europe while Africa enjoys cool rains and the Sahara is no desert at all. But strangest of all may be the science of seeing, hearing, and controlling the souls of the dead using a golden metal with many names: sunsteel, orichalcum, and... AETHERIUM!