Corvus' Steel Fury

All creatures within a 30-foot sphere of you must succeed a Dexterity saving throw or take 5d10 Force damage on a failed save and half as much damage on a successful one.

Your spell save DC increases by 1 until the end of your next turn for each failed saving throw.

Using a Higher-Level Spell Slot. The damage increases by 1d10 for each spell slot level above 5.