The Rituals of Hali

The members of the cult of the Yellow King groveled before a roaring bonfire. The cult leader, an enigmatic old man named Prynn, chanted aloud an incantation from The Rituals of Hali, an ancient book written in a tongue that only a handful of scholars across the world could read. That book revealed the path to eternal life in the mortal shell and the awful price to be paid .
Blood ran freely from the runes Prynn had carved into his chest. The wounds that would scar not just his flesh but his very soul and forever mark him as a servant of the Yellow King.
 Prynn completed the incantation and the old wizard grinned as the avatar of the Yellow King emerged from the flames. It's shape was hazy and indistinct, Prynn had the impression of great height, ragged yellow robes, and an ivory mask covering the face. The creature bent close to whisper something into Prynn's ear. Without hesitation Prynn sank to his knees before the entity and presented his wrists. A blade flashed from somewhere within the Yellow King's tattered robes to slice across the outstretched wrists and more of Prynn's blood splattered the ground. The cult leader lifted a quill with numbing fingers and signed his name in blood on the outstretched palm of the hideous thing. His name was but one of many, most of them in languages forgotten before the first stones were laid in Sumeria. Prynn fell to the ground, fainting from blood loss.

The Yellow King turned to face the grovelling cultists and their ecstasy turned to horror as he assumed his true shape to begin the feast. The screams lasted long into the night.

 Prynn awoke the next morning amid the butchered remains of what had been twenty foolish humans. I didn't matter, he had been reborn as a servant of the Lord of Hali and granted one hundred years of life until the stars wheeled around and the time came to renew his pact with the Yellow King. So would it be forever until he failed to pay the tribute of blood and souls his terrible master required. Prynn hid the Rituals of Hali, the book must be preserved for he knew his name would not be the last written on the hand of the Yellow King.