2nd-level Evocation

Casting Time: 1 action
Range: Self (20-foot cone)
Components: V, S
Duration: Instantaneous
Class: Bard, Druid, Sorcerer, Warlock, Wizard
Sourcebook: L’Arsene’s Ledger

A wave of sheet lightning sweeps out before you. Each creature in a 20-foot cone originating from you must make a Constitution saving throw. On a failed save, a creature takes 2d8 lightning damage and can’t take reactions until the start of its next turn. On a successful save, the creature takes half as much damage and can take reactions as normal.
At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 per slot level above 2nd.