The Empyrean Odyssey (omnibus)

The Empyrean Odyssey is an omnibus of The Empyrean Odyssey trilogy written by Thomas M. Reid. The novels included in this book are The Gossamer Plain, The Fractured Sky, and The Crystal Mountain. The omnibus includes an introduction written by the author.

"Aliisza and Kaanyr Vhok have returned from their attempted invasion of Menzoberranzan and set their sights on Sundabar. But before she can complete a mission in that besieged city, Aliisza finds herself in the one place a demon would never want to go, no matter how sure she is of her wits and cunning: the very heart of Celestia.

But Aliisza soon discovers that being held captive in Celestia is just a distraction for a far deeper and more deadly scheme. One that threatens all of the Forgotten Realms world. One that, as much as she hates to admit it, the angels of Celestia really should know about. But how is she going to convince the angels that she, a demon, could have more in mind than destruction?

The Empyrean Odyssey features the return of popular characters Aliisza and Kaanyr Vhok, from Thomas Reid's Insurrection, the second book in the New York Times best-selling series, R.A. Salvatore's War of the Spider Queen. Forgotten Realms fans won't want to miss this epic tale of two fiends struggling to escape the heart of a deeply troubled Celestia."

The Gossamer Plain
The cambion Kaanyr Vhok plots with the Banite priest Zasian Menz to use Aliisza to access the Lifespring in Celestia in order to gain great power and charisma. and his Scoured Legion invade Sundabar as

The Fractured Sky
Vhok and Aliisza are forced to aid the angels of Celestia as Zasian crosses the plains with the intention of killing Mystra.

The Crystal Mountain
Vhok takes advantage of the planes reeling from the Spellplague and allies with a demon to invade Celestia to obtain the Lifespring. Aliisza is forced to decide where her loyalties lie.