You shoot a greenish ray at a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 2d8 Poison damage and has the Poisoned condition until the end of your next turn. Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 1.
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.