Grasping Tentacles. All over the creature's body grow tentacles of up to 20 feet in length. A darktentacles commonly has enough tentacles to contend with multiple opponents simultaneously. They may slap, grasp, and constrict opponents, or wield weapons. Each tentacle is AC15, and is immune to psychic and poison damage. Attacks against tentacles that do at least 5 damage cause them to let go. 10 or more damage severs a tentacle. Destroying tentacles does no damage to the darktentacles.

Magic Resistance. The darktentacles has advantage on saving throws against spells and other magical effects.

Predatory Senses. Each tentacle is studded with many small, shielded nodes that see as humans do, but also have darkvision. A darktentacles also senses vibrations, "smells" substances in water, and discerns color and light differences through nodes all over its body.

Multiattack. The darktentacles uses Constrict. It can then simultaneously battle as many opponents as it can reach. Each opponent may be attacked by up to 5 tentacles at a time, or 2 tentacles at a time if they are wielding weapons (weapons deal their normal damage).

Constrict. The darktentacles deals 7 (1d6+4) bludgeoning damage to each creature for each tentacle grasping it. It then pulls each of those creatures 10 feet straight toward it.

Tentacle. Melee Weapon Attack: +7 to hit, reach 20 ft., one target. Hit: 6 (1d4+4) bludgeoning damage or it can grasp a target. Creatures grasped by 1-2 tentacles are grappled (escape DC15), 3-4 tentacles cause the creature to become restrained, and 5 tentacles will make a creature incapacitated.

Charm (3/day). A creature that is held by 4 tentacles is subject to being hypnotized by the darktentacles. The targeted creature must make a wisdom save, DC12. Failure causes the creature to do all that it can to help and protect the darktentacles; success negates the effect.

Wall of Force (1/day). The darktentacles can create a wall of force, using it to isolate prey, dangerous foes, or provide a means of escape for itself. The wall of force takes concentration, has a range of 120 feet, and can last up to 10 minutes.