Darna'val's Vampiric polymorph

You enter the coffin and lie down, and whisper necrotic words and drink the blood in the bottle, and fall into a trance.

You wake up in the coffin one hour later, completely a vampire, and have the stat block of a vampire, except your intelligence, wisdom, charisma and alignment are kept. 

At the end of the duration, you fall into another trance for 1 hour, and wake up as your normal character. If you use your bite attack on yourself during the vampirism, you stay as a vampire forever.

"My daily routine starts off with a 9th level spell, you don't need sleep, food, or drink when your undead!" - Darna'val