Evard's Black Tentacles

4-level Conjuration

Casting Time: 1 action

Range/Area: 90 ft. (20 ft. cube)

Components: V, S, M

Materials: a piece of a tentacle from a giant octopus or a giant squid

Duration: 1 minute (concentration)

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 Strength 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.

At higher levels:

At Higher Levels: When you cast this spell using a spell slot of 5th-level or higher, the initial damage increases by 1d6 for each spell level above 4th.

Available for: Wizard, Warlock, Shadow Domain, Circle of Shadows, Aberrant Sorcery, The Great Old One, The Many