Vlad's Alchemical Combustion

Creating sparks from your components or spell focus, you magically increase the flammability of all things within range. This spell ignites any flammable objects in the area that aren't being worn or carried. Ignited objects require a creature to make a dexterity check versus your spell save dc in order to be extinguished, otherwise taking 4d4 fire damage at the end of each of your turns that the object burns for. Creatures within range must make a Dexterity saving throw or be set on fire for duration, taking 4d4 fire damage at the end of each of your turns. The effect ends on a creature if they or another creature use an action to make a dexterity check to put out the flames.