Azure Gravefire

You summon a swirling flame of supernatural blue fire around a creature you can see within range.

The target must make a Dexterity saving throw. On a failure, it takes 3d6 cold damage + 2d6 necrotic damage and becomes surrounded by ghostly blue flames. On a success, it takes half damage.

While surrounded by the flames, the creature takes 1d6 cold damage at the start of each of its turns.

The flames don't produce heat and shed bright light in a 10-foot radius.

At Higher Levels: The initial damage increases by 1d6 cold damage for each slot level above 2nd