Cuthrow’s Crackling Cage

Sending an electrical current through the cage causes an arc of lighting to confine an area of a 10 foot cube in electrical energy. The electrical cage can be seen through and can be reached through. Any creature that fits within the cage is trapped.

When a creature interacts with the cage in any fashion, it must make a Dexterity saving throw taking 3d12 lightning damage on a failed save and half on a successful save. On a failed save the creature retreats from the bars remaining confined with if already inside or away from the cage if outside. On a successful save the creature can pass through the cage.

As an bonus action the caster may cause the cage to zap whatever remains inside. The creature must succeed a Dexterity saving throw or be zapped for 3d12 lightning damage on a failed save, and half damage on a successful one.

At higher levels: When casting the spell at a higher levels the area of the cage increases by 5ft on every side and increases each damage die by one for every level above four.