The Last Hunter - Ascent (Book 3 of the Antarktos Saga)

The protagonist, Solomon Ull Vincent, grapples with the devastating consequences of his past actions after being kidnapped and corrupted by the Nephilim. Twenty years have passed, and he remains trapped in Tartarus, tormented by guilt over the billions who died due to his connection with Nephil, the Lord of the Nephilim. Despite the overwhelming despair and loss of his powers, Solomon is determined to escape this hellish existence and reunite with his new family, Em and Luca, seeking redemption and a chance to reclaim his life.