Check out the Astral Deadnought from Mordenkainen's Tome

WotC's Nathan Stewart celebrated hitting 5,000 Twitter followers by sharing a page from Mordenkainen's Tome of Foes, the upcoming D&D book due for release next month. The art gloriously evokes Jeff Easley's art from the cover of 1987's Manual of the Planes (a monster originally called an "ethereal dreadnought" and changed to "astral dreadnought" in D&D 2E).

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[dave2008]

Is that supposed to be scary? It's big three-legendary-action special ability does 15 damage, with a save for half.

It is a bit weak for me too; however it is pumping out a 131 DPR. The legendary action is 15 to all opponents (still not enough IMO), but I used three claws at 19 to figure the DPR.

 

[dave2008]

Let's see what @dave2008 's version looks like.

Mine is a little tougher, but I really like the Donjon trait.

5e Epic Monster Update - Astral Dreadnought:
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ugh! I see some typos that need corrected!
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[The Crimson Binome]

A level 20 barbarian has to succeed on a DC 19 Charisma saving throw every round or lose its turn. That's one dead barbarian, if you ask me.

No, because it can only take a legendary action at the end of an enemy's turn. The barbarian is gone for their turn, so they aren't around to trigger the legendary action. And even if the DM did rule that way, that would mean the barbarian was gone for the monster's turn, so it couldn't actually attack them. In the worst case scenario, the fight takes twenty times as long as normal, since it still progresses along its natural course but only advances during rounds when the barbarian saves successfully.

The monster gets substantially more powerful if the barbarian has allies.

 

[TerraDave]

FYI, the DMG list effective HP.

FYI you don't multiply for resistance with a CR 21 creature. But you seem to figure that out latter on in your reply.

 

[darjr]

I don’t think you get flight just cause your astral. Close cause you can choose what is “down” but if you can’t fly your falling. I think.

 

[MonsterEnvy]

I don’t think you get flight just cause your astral. Close cause you can choose what is “down” but if you can’t fly your falling. I think.

This is almost correct. There is a sorta floor to the Astral Plane and you gain a movement speed (Walking explicitly not flying.) equal to 3 x your intelligence score.

 

[dave2008]

FYI you don't multiply for resistance with a CR 21 creature. But you seem to figure that out latter on in your reply.

Your right - I was thinking about immunities. My bad!

 

[dave2008]

No, because it can only take a legendary action at the end of an enemy's turn. The barbarian is gone for their turn, so they aren't around to trigger the legendary action. And even if the DM did rule that way, that would mean the barbarian was gone for the monster's turn, so it couldn't actually attack them. In the worst case scenario, the fight takes twenty times as long as normal, since it still progresses along its natural course but only advances during rounds when the barbarian saves successfully.

The monster gets substantially more powerful if the barbarian has allies.

Yes, I have always ruled a legendary monster gets all of its unused legendary actions at the end of the round. It makes more sense to me (I write it that way in my stat blocks)

 

[MonsterEnvy]

Hmm ok...

...but seriously, who uses astral projection anyway.

People that want an almost risk free transport to other planes.

 

[AmerginLiath]

Cue the dreadnaught swallowing the only planar caster and sailing off through the astral, crying out a Three Stooges “Woop woop woop” as the rest of the party wonders what it’s going to do now...