Crippling Wave

4th-level necromancy

Casting Time: 1 action
Range: Self (100 feet)
Components: V, S
Duration: 1 minute (requires concentration)
Classes: warlock, wizard

A wave of dark energy courses out to form a line 100 feet long and 5 feet wide in a direction you choose. Each creature that enters the line for the first time on their turn or starts their turn there must make a Constitution saving throw. On a failure the creature’s movement speed is halved and the creature can only deal half damage with weapon attacks that use Strength until the start of their next turn.

On each of your turns for the duration, you can maintain the spell. The spell ends if you use your action to do anything else. As a bonus action on subsequent turns, you can redirect the line, maintaining yourself as the point of origin.