Negative energy ripples out in a 60-foot-radius Sphere from a point you choose within range. Each creature in that area makes a Constitution saving throw, taking 8d8 Necrotic damage on a failed save or half as much damage on a successful one. Using a Higher-Level Spell Slot. The damage increases by 2d8 for each spell slot level above 6.
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.