Eldrakar’s Pulse of Decay

You release a wave of withering energy. Each creature in a 15-foot Cone makes a Constitution saving throw, taking 2d10 necrotic damage on a failed save, or half as much on a success. Nonmagical plants and organic matter in the area wither and die instantly.

Using a Higher-Level Spell Slot. The damage increases by 1d10 for each spell slot level above 1.