Blightfire

You create a flickering flame imbued with radiant energy, designed to target Blighted creatures. Make a ranged spell attack against a creature within range. On a hit, the target takes 1d8 radiant damage. If the target is a Blighted creature, it takes an additional 1d6 radiant damage at the start of its next turn. This flame cannot ignite objects or spread to other creatures.

Special Option:
You can sacrifice 2 hit points when casting this spell. If you do, the damage increases by 1d6 radiant damage.

*Its fire does not spread*

At Higher Levels: The spell’s initial damage increases by 1d8 when you reach levels 5 (2d8), 11 (3d8), and 17 (4d8). The bonus damage against Blighted creatures remains 1d6 at all levels unless enhanced by the special option.