You spray toxic mist at a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d12 Poison damage. Cantrip Upgrade. The damage increases by 1d12 when you reach levels 5 (2d12), 11 (3d12), and 17 (4d12).
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.