Dumon's Explosivo Surprise

You create an explosive bubble of flames and ash, then hurl at a creature within range.  The target must make a Dexterity saving throw. On a failed save, the target has the bubble stick to it and suffers from the Chain Link condition for the duration. 

Chain Link. While afflicted, each time the target fails a Constitution saving throw, they take 2d12 fire damage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d12 for each slot level above 1st.