Evard's Black Tentacles

Evard's Black Tentacles PHB p238 4th-level conjuration 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.

Classes: Wizard Subclasses: Aberrant Mind Sorcerer, Arcane Trickster Rogue, Eldritch Knight Fighter, Fathomless Warlock, Great Old One Warlock Subclasses (legacy): Aberrant Mind (UA) Sorcerer, Lurker in the Deep (UA) Warlock Source: PHB, page 238. Available in the SRD (as "Black Tentacles").