Cascade of Lightning

Summon a cascade of lightning to strike a spot within range for 1 minute. Any creatures caught within the lightning have to make a Dexterity saving throw (DC15) or take 5d8 lightning damage and is paralyzed for the duration of the spell. On a successful save, the creature takes half damage, but is still paralyzed for the duration of the spell. 

This spell can be used to trap creatures too. By casting Cascade of Lightning and focusing on how the lightning falls, the caster can use it as a cage, limiting the movement of the creature to 5 feet and is considered to be prone. When the spell is cast like this, the creature can break out of the cage by making a Constitution saving throw (DC15) and take 5d8 lightning damage and is considered stunned until the end of their second turn. On a successful saving throw, the creature takes half damage and is only stunned until the end of their first turn,