Bomba

You enhance a bomb or some other explosive ordinance that you are able to carry, light, and throw, such as a stick of dynamite, that isn't already enhanced by this spell. 

You transmute and magically shape the compounds of the explosive adding more to its potential, an enhanced explosive uses your spell saving throw DC instead of its own, a creature that fails the saving throw against the explosive takes an additional 1d10 fire damage on top of its damage or half this damage on a save.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d10, for each slot level above 1st.