Burning Hands
A thin sheet of flames shoots forth from you. Each creature in a 15- foot Cone makes a Dexterity saving throw, taking 3d6 Fire damage on a failed save or half as much damage on a successful one. Flammable objects in the Cone that aren't being worn or carried start burning.
Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 1.
Burning Hands 5.5e 2024 vs. 5e 2014 edition differences
Both versions deal 3d6 fire damage in a 15-foot cone with a Dexterity save, increasing by 1d6 per spell slot above 1st. The 2024 version clarifies the damage increase wording and simplifies the description; no significant mechanical differences are present.