Arc Lightning

A crackling bolt of electricity leaps from your fingertips, striking a creature within range. The target takes 1d8 lightning damage and must make a Constitution saving throw. On a failed save, the creature has disadvantage on the next Dexterity saving throw it makes until the start of your next turn.

The target automatically fails the Constitution saving throw if it is wet or wearing metal armor. Constructs made primarily of metal automatically fail the Constitution saving throw.

This spell’s damage increases by 1d8 when you reach certain levels: 5th level (2d8), 11th level (3d8), and 17th level (4d8).