Feral Scream (Cho'Gath W)

You unleash a powerful roar in a 90-degree, 20-foot cone in front of you. Each creature in the area must make a Constitution saving throw. On a failed save, a target takes 4d6 thunder damage, or half as much on a successful one. Creatures that fail the saving throw lose concentration on any active spells and cannot cast spells until the start of your next turn.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3.