Elphelt's Swarming Vines

Squirming, verdant vines fill a 10-foot square on ground that you can see within range. For the duration, these vines turn the ground in the area into difficult terrain.

When a creature enters the affected area for the first time on a turn or starts its turn there, the creature must succeed on a Dexterity saving throw or take 5d6 bludgeoning damage and be restrained by the vines for the duration. A creature that starts its turn in the area and is already restrained by the vines takes 5d6 bludgeoning damage.

On subsequent turns, you may use a bonus action to move the vines up to 10 ft. in a direction of your choice.

A creature restrained by the vines can use its action to make a Strength (Athletics) or Dexterity (Acrobatics) check (its choice) against your spell save DC. On a success, it frees itself.

At Higher Levels. For every level of spell slot above 4th, add an additional 1d6 to the spell's damage dice.