Tendrils of Twilight

Void tendrils erupts from the ground in a 30ft radius. Make an attack against each enemy within the radius and on a hit, the creature's movement becomes restricted by the tendrils halving their movement speed. If a creature moves more than 10ft from the location where they were originally grappled the tendril snaps and the creature becomes frightened of the caster. At the end of each of it’s turns, a frightened creature repeat the saving throw.