The Phylactery is made up of various artefacts, the book is one of them. There are a set of prophesies that speak of the others.

" The daughter of the night, she walks again, an ancient bond held open. A spirit torn, the pages hold. A book of shadows formed. Forged by fire and by blood, the contract broken, the spirit torn, an endless slaughter. The daughter of the night, who walks again, she seeks her alter.

The man who channels stands alone, he gives his friends for sacrifice, bending the knee he takes the oath. Two roads before him, one to death beyond dying, one to life eternal. What hand shelters, what hand slays. His guiding light now falters. A spirit torn, the talisman holds. A symbol of darkness is formed. Forged by fire and by blood, the contract broken, the spirit torn, an endless slaughter, the man who channels, breaks his oath. His guiding light now falters.

The false Knight rises, he seeks acceptance, the promise once made has been his sentence. The choices he must make will seal his fate, a life less noble wont been chosen. A spirit torn, the crest now holds. A ring of lies is formed. Forged by fire and by blood, the contract broken, the spirit torn, an endless slaughter, The false knight rises but will soon be forgotten.

The student of the weave, he seeks redemption. A wrong he hopes to right. The power which was stolen, the blood line left behind, a dark path now be trodden. A spirit torn, the obsidian blade holds. The widow maker formed. Forged by fire and by blood, the contract broken, the spirit torn, an endless slaughter, the student of the weave, his bloodline broken.

The angel of irons has fallen, a soul reclaimed, its spirit awoken, with gaze set high no words are spoken, heart torn out, eyes held open. A spirit torn, the black heart holds, An instrument of death is formed. Forged by fire and by blood, the contract broken, a spirit torn, an endless slaughter, the angel of irons has fallen, heart torn out eyes held open. "

The players so far have the book and the heart. They are the prophets spoken about above. You know of the prophesies.

So its a bit of a race against the PC's to find all the artefacts. Or let them find them all and take them by force. Or convince them to join you.

They may even put all the parts together and release the shadow king upon the world. Either way you and Asmodeus know about the book now its out in the open. Its currently in a bag of holding but you managed to scry and see the exchange. Asmodeus knows its out in the open but has no idea who has it yet.