Fire Breath (Recharge 5-6). Dexterity Saving Throw: DC 11, each creature in a 20-foot-long, 5-foot-wide Line. Failure: 14 (4d6) Fire damage. Success: Half damage.
Sleep Breath. Constitution Saving Throw: DC 11, each creature in a 15-foot Cone. Failure: The target has the Incapacitated condition until the end of its next turn, at which point it repeats the save. Second Failure: The target has the Unconscious condition for 1 minute. This effect ends for the target if it takes damage or a creature within 5 feet of it takes an action to wake it.
RollQuest ships the D&D 2024 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.