Cosmic Gatherers

Multi-elemental

Freedom of Movement. The Gatherer ignores difficult terrain as they are a floating entity, and magical effects can't reduce its speed or cause it to be restrained. It can spend 5 feet of movement to escape from nonmagical restraints or being grappled.

Siege Monster. The Gatherers are sent to abduct creatures and humanoids, and depending on size, entire buildings and cities. They normally are sent to areas that are destined to be destroyed by natural events. 

Multiattack. The Gatherers make three tentacle attacks, each of which can be replaced with one use of Fling.

Bite. Melee Weapon Attack: +17 to hit, reach 5 ft., one target. Hit: 23 (3d8 + 10) piercing damage. Suppose the target is a Large or smaller creature grappled by the Gatherer. In that case, that creature is swallowed and teleported to the destination that the Gatherer has been summoned from, and the grapple ends. 

Suppose the Gatherer takes 20 damage or more on a single turn from a creature inside it. In that case, the Gatherer must succeed on a DC 25 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures that fall prone in a space within 10 feet of the Gatherer. Upon death, any creatures swallowed remain in the dimension the creature was conjured from.

Tentacle. Melee Weapon Attack: +17 to hit, reach 30 ft., one target. Hit: 20 (3d6 + 10) bludgeoning damage, and the target is grappled (escape DC 18). Until this grapple ends, the target is restrained. Most Gatherers have four tentacles, each of which can grapple one target.

Fling. One Large or smaller object held or creature grappled by the Gatherer is thrown up to 60 feet in a random direction and knocked prone. If a thrown target strikes a solid surface, the target takes 3 (1d6) bludgeoning damage for every 10 feet it was thrown. If the target is thrown at another creature, that creature must succeed on a DC 18 Dexterity saving throw or take the same damage and be knocked prone.

Cosmic Storm. The Gatherer, at will, can magically create three bolts of cosmic energy, each of which can strike a target the Kraken can see within 120 feet of it. A target must make a DC 23 Dexterity saving throw, taking 22 (4d10) lightning damage on a failed save, or half as much damage on a successful one.