Rhyn Eternal (Volume Two) 2012-2017: Five Year Anniversary Edition

Rhyn Eternal Volume Two. Includes: Darkyn's Mate and The Underworld.
Darkyn's Mate
Stuck in Hell, human-Deidre struggles to hold onto her hope that she can change the course of events that landed her as the mate of Darkyn, the Dark One. The chances of her leaving Hell plummet when the Dark One takes a drastic step to ensure he never loses his latest possession and blood binds her in an ancient rite from the time-before-time. In doing so, he is forced to share his power with her. Rather than despair, she begins to see that she has unexpectedly found her place in the world: protecting innocent souls from the bloodlust of the demon she's forever bound to.
The Underworld
The time has come for Gabriel to claim his underworld. Accompanied by the deceptive Dark One, he risks everything to find his mate and take his place as the deity Death. Between him and the only woman he's ever loved: a handful of rebelling death dealers, the deity Karma and the Dark One's mate, a human-turned-demon who holds his soul in the palm of her hand.
Time is running out, and Gabriel has one chance to make things right, even if it means letting go of the last part of him that's human.