Conflagration

You point at a creature within range and mentally command it to burst into flame. The creature must make a Dexterity saving throw. If the saving throw fails, it takes 6d10 + 20 fire damage and begins burning; on a successful save, it takes half damage and suffers no other effect.

A burning creature takes 2d10 fire damage at the end of each of its turns. The fire can’t be extinguished by natural means; it burns for the duration of the spell.