Tether

Magical chains bind a creature to the earth, preventing its aerial escape. You select a creature with a fly speed within range. The target must succeed on a Strength saving throw or be affected by this spell for the duration. An affected target's speed is reduced by 5 feet and it cannot be more than 5 feet off of the ground or floor that you are standing on

The target can make another Strength saving throw at the end of each of its turns, freeing itself on a success