Potion

Rare

This sticky red liquid has a living viscosity to it, churning slowly within the flask. When you drink this potion, you become a fiend (as if by the spell Shapechange for 1 hour). The type of fiend you become is determined by your level. The new form is a random fiend with a Challenge Rating equal to your level, up to a maximum of 10. If there are multiple options at that Challenge Rating, roll to determine which option is selected.
When the effect ends and you revert to your normal form, you take 1d6 necrotic damage equal to the CR of the fiend who’s form you assumed as the toxins of pure evil attempt to destroy your body before relinquishing control of it. If this damage kills you, your soul is dragged to the realm of the fiends by the malignant will of the fiend.