Astral Dreadnought

Gargantuan

Monstrosity (titan)

unaligned

20 (Natural armor)

297 (17d20 +119)

3m, fly 16m (hover)

28 (+9)

7 (-2)

25 (+7)

5 (-3)

14 (+2)

18 (+4)

Dex +5, Wis +9

Perception +9

Bludgeoning, piercing, and slashing from nonmagical attacks

Charmed, exhaustion, frightened, paralyzed, petrified, poisoned, prone, stunned

Darkvision 24m, passive Perception 19

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21 (33,000 XP)

The astral dreadnought's opened eye creates an area of anti magic, as in the antimagic field spell, in a 30m cone. At the start of each of its turns, the dreadnought decides which way the cone faces. The cone doesn't function while the dreadnought's eye is closed or while the dreadnought is blinded.

The astral dreadnought can't leave the Astral Plane, nor can it be banished or otherwise transported out of the Astral Plane.

Any creature or object that the astral dreadnought swallows is transported to a demiplane that can be entered by no other means except a wish spell or this creature's Donjon Visit ability. A creature can leave the demiplane only by using magic that enables planar travel, such as the plane shift spell. The demiplane resembles a stone cave roughly 300m in diameter with a ceiling 30m high. Like a stomach, it contains the remains of the dreadnought's past meals. The dreadnought can't be harmed from within the demiplane. If the dreadnought dies, the demiplane disappears, and everything inside it appears around the corpse. The demiplane is otherwise indestructible.

(3/Day) If the astral dreadnought fails a saving throw, it can choose to succeed instead.

An astral dreadnought's weapon attacks are magical.

If the astral dreadnought scores a critical hit against a creature traveling through the Astral Plane by means of the astral projection spell, the dreadnought can cut the target's silver cord instead of dealing damage.

The astral dreadnought makes three attacks: one with its bite and two with its claws.

Melee Weapon Attack: +16 to hit, reach 2m, one target. Hit: 36 (5dl 0 + 9) piercing damage. If the target is a creature of Huge size or smaller and this damage reduces it to 0 hit points or it is incapacitated, the astral dreadnought swallows it. The swallowed target, along with everything it is wearing and carrying, appears in an unoccupied space on the floor of the astral dreadnought's Demiplanar Donjon.

Melee Weapon Attack:+ 16 to hit, reach 4m, one target. Hit: 19 (3d6 + 9) slashing damage.

The astral dreadnought can take 3 legendary actions, choosing from the options below. Only one legendary option can be used at a time and only at the end of another creature's turn. The dreadnought regains spent legendary actions at the start of its turn.

The astral dreadnought makes one claw attack.

(Costs 2 Actions) One creature that is Huge or smaller that the astral dreadnought can see within 12m of it must succeed on a DC 19 Charisma saving throw or be magically teleported to an unoccupied space on the floor of the astral dreadnought's Demi planar Donjon. At the end of the target's next turn, the target reappears in the space it left or in the nearest unoccupied space if that space is occupied.

(Costs 3 Actions) Each creature within 12m of the astral dreadnought must make a DC 19 Wisdom saving throw, taking 15 (2d10 + 4) psychic damage on a failed save, or half as much damage on a successful one.