The Water Crystal Deal With The Devil by Alfred Muller

Sharing a drink with the Devil is far more perilous than it appears.

Main blurb: When Anthony Luther reluctantly attends his friend's graduation party, he expects the night to go badly. What he doesn't expect is for it to end in fire and bloodshed. Already a favorite target for the local cops, it doesn't take much for them to point the finger his way. But Anthony knows something they don't: the real culprit is no ordinary murderer, but the Devil's attack dog sent to drag Anthony back to hell. Having been formerly deceased, he's well acquainted with the afterlife—particularly its darker corners.

Anthony's best friend, Dezeray Lilet, has a past shrouded in the occult. As Anthony's dark history resurfaces, Dezeray's own demons are pulled from the cobwebs of her mind, threatening her sanity amid the brewing chaos. Together, they must navigate a labyrinth of supernatural threats and personal revelations.
With help from an outcast Archangel and an elder priest who walks the fine line between right and wrong, Anthony and his friends must uncover the true purpose of the Devil's scheme. The playing field shifts when a mysterious artifact from Angelic myths falls into Anthony's hands, offering a glimmer of hope against the most deceptive force in existence.

In this gripping tale of self-discovery, friendship, and love, Anthony must confront his past, battle the Devil's minions, and decipher the enigma of an ancient relic—all while keeping his friends and his soul intact.