Black Tentacles

4th-level Conjuration

Concentration
Casting Time
Action
Range
90 feet
Duration
Concentration, up to 1 minute

Components

V (Verbal) S (Somatic) M (Material)
Material Components: a piece of tentacle from a giant octopus or squid

Description

Squirming, ebony tentacles fill a 20-foot square on ground within range. The area becomes Difficult Terrain. When a creature enters the area or starts its turn there, it must succeed on a Dexterity save or take 3d6 Bludgeoning damage and be Restrained.
Source: SRD 5.1