The Darkest Fire by Gene Showalter is a prequel to the Lords of the Underworld series. It focuses on the love story of Kadence the goddess of Oppression and Geryon the Guardian of Hell. Geryon was guarding the gates of hell making sure that none of the demons escaped and then Kadence bought his soul from Lucifer to free him. Geryon has a monstrous appearance with horns and claws with poison. Kadence has a very angelic appearance with long blonde hair and light porcelain skin. Kadence ended up dying at the end and then Geryon killed himself to be with her after the walls fell. Overall it was kind of beauty and the beast style of story but it was a super enjoyable read and they were both super likable.
I would give it a 9/10.
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