Dark Lightning

5th-level evocation

Casting Time: 1 action

Range: Self (100-foot line)

Components: V, S, M (500 gp worth of small gemstones)

Duration: Instantaneous

A bolt of purple-tinged black lightning streaks forth from your hands, silencing the area for a split second like an eerie void.

Creatures within the 100-foot long, 5-foot wide line must make a Dexterity saving throw. A creature takes 9d6 lightning damage and loses 1d6 prepared spells at random on a failed save, or half as much damage and no loss of prepared spells on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 6th or higher, the damage increases by 1d6 and prepared spell loss increases by +1 for each spell slot above 5th.