Acid Breath (Recharge 5-6). Dexterity Saving Throw: DC 11, each creature in a 20-foot-long, 5-foot-wide Line. Failure: 18 (4d8) Acid damage. Success: Half damage.
Slowing Breath. Constitution Saving Throw: DC 11, each creature in a 15-foot Cone. Failure: The target can't take Reactions; its Speed is halved; and it can take either an action or a Bonus Action on its turn, not both. This effect lasts until the end of its next turn.
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.