Crusch's Blood boil

The caster touches a creature injecting dirty water into its blood stream. On a hit, the target takes 2D8 necrotic damage as the mix of dirt and water phase through the skin. On hit the dirt in the blood heats up. The target must succeed on a Constitution saving throw or take 1D6 fire damage and have their movement halved. If they fail the save, you can use your action on consecutive turns to deal 1D6 fire damage to the target so long as it is within range(30ft).

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can roll an additional 1D6 and add 2 hours to the duration for each slot level above 2nd.