4th-level Evocation

Casting Time: 1 action
Range: 150 feet
Components: V, S, M (a rod of quartz and copper wire)
Duration: Instantaneous
Class: Bard, Druid, Sorcerer, Warlock, Wizard
Sourcebook: L’Arsene’s Ledger

You fire a concentrated bolt of energy at a target within range, which explodes in a cloud of crackling lightning. The target must make a Constitution saving throw. On a failure, the target takes 8d8 lightning damage and can’t take reactions until the start of its next turn. A creature that fails by 5 or more is also stunned until the end of its next turn. On a success, a creature takes half as much damage, isn’t stunned, and can take reactions as normal.
At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 4th.