Evard's Black Tentacles

From Player's Handbook, page 238.

Description
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.

Learned By

 * Classes: Wizard
 * Subclasses: Fighter (Eldritch Knight), Rogue (Arcane Trickster), Sorcerer (Aberrant Mind), Warlock (The Fathomless), Warlock (The Great Old One)