Casting Time: 1 action
Range: 90 feet
Components: V, S, M (a piece of tentacle from a giant octopus or a giant squid)
Duration: Concentration, up to 1 minute
Squirming, ebony tentacles fill a 20-foot square on ground that you
can see within range. For the duration, these tentacles 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 3d6 bludgeoning damage and be restrained by the tentacles
until the spell ends. A creature that starts its turn in the area and is
already restrained by the tentacles takes 3d6 bludgeoning damage.
A creature restrained by the tentacles can use its action to make a
Strength or Dexterity check (its choice) against your spell save DC. On a
success, it frees itself.