D&D
One player has chosen to change their character so they can be a necro-cleric of the whispering way and its become this whole sidequest to explain the class and race change where I've created this intelligent item out of an item I gave him already which is the spell book and phylactery of Ozturk Akeley, an original disciple of Tar Baphon ( the lich Buddha basically he created the whispering way and he's from the source material " Inner Sea Gods " ). Ozturk Akeley was a duergar wizard and his grimoire and phylactery is bound in the faces of killed fairies and surface elf fetuses, titled " XIII " ( Originally it was a ritual book I passed the PC to help them do more necro stuff they wanted ). So the PC ( His name is stupid , Ricky Spanish ) is studying the book and he cuts his finger on it, which awakens the shade of Ozturk Akeley. Ozzie then is like , " You who would attain the perfection of death ... seek the angel blooded one and use this dweomer upon them ... " The pages then turn to a scroll of greater possession. Ricky is meant to seek out a living Aasimar and possess them, then perform a ritual to permanently eat their soul and use it as a battery for his new divine magic ( Which is the excuse to delete his sorcerer and fighter levels for cleric levels ). I'll let him keep the pittance of arcane spells he knows so that he qualifies for mystic theurge later ( Why not ) but now to stave off " Soul Rot " hell need to consume souls ( A spell , but can be used as a special ritual off the OA rules ) ( by using blood as a material component to create a sympathetic link with the victim ) daily or take con damage. I'll create an arbitrary limit on the souls but let him spend them as a secondary cost to taking lichdom manifestations as feats . Also I'm going to have Ozturk Akeley tutor him in secret language Deep Mandaic using Ricky's aklo knowledge as a base, " Together we will recreate the tongue of the King Undying " ( Yea I just ripped off Cultist Sim and The Locke Tomb in that sentence ) ... and the second half of the book is written in this language, so hell have to take a rank in it. But in return ill pipe him all sorts of necromantic goodies . Yea, the party paladin is gonna love this... I'll have to find something special for the other two now so they can have a side quest as well .