Embercloud

You invoke a small cloud of embers.  Choose a point within range that you can see.  All creatures in a 5-foot radius cube around that point must succeed a Constitution saving throw or take 1d4 fire damage.  Creatures that don't breathe automatically succeed this saving throw.

The spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).