Electronarcosis (Keshanar)

Choose one creature you can see within range. The space around it becomes charged with electricity, which quickly draws into the creature. The creature must make a Dexterity saving throw, taking 10d6 Lightning damage on a failed save or half as much damage on a successful one. If the creature takes any damage from this spell, it must then make a Constitution saving throw or become Incapacitated until the end of its next turn.

Using a Higher-level Spell Slot. The damage increases by 1d6 for each spell slot level above 5.