Create Alchemist's Fire

You create an burst of colored fire at a point within range, where it explodes in a 5-foot-radius Sphere. Each creature in that Sphere must succeed on a Dexterity saving throw or take 1d4 Fire damage and start burning. A creature on fire continues to take this damage at the start of each turn until they use a Bonus Action to put themselves out.

Cantrip Upgrade. The damage increases by 1d6 when you reach levels 5 (2d6), 11 (3d6), and 17 (4d6).