Oozes are one of those fairly limited creature categories, with very few that rise to high CR levels. In Mordenkainen's Tome of Foes and the reprinting in Monsters of the Multiverse, we got the Oblexes, but beyond those, your typical ooze is more of a threat for low-level parties.
And now we have an Ooze Titan.
The Blob of Annihilation is likely the largest monster in 5th Edition (unless the Cosmic Horror from... Spelljammer I think? is). There's a table for the kind of things you can find inside one, which includes a dead Tarrasque.
Blobs of Annihilation are unthinking alien mountains of goo that fall from Wildspace and just start consuming everything in their paths.
They are CR 23 evil oozes, with an AC of 18 and 448 HP. They also have resistance to Bludgeoning, Piercing, and Slashing damage as well as immunity to Acid, Necrotic, and Poison damage.
They also can't be permanently killed - if reduced to 0 HP, they implode and reconstitute in 1d20 years.
But while I described them earlier as unthinking, they actually have an Intelligence of 10, so you could potentially play them as having some intentionality. Frankly, though, I think that's more about having a non-negative Int save bonus than really doing anything to describe the monster.
They have a 30-foot movement speed, which is kind of slow for a creature this big.
They are also relatively simple to run - their multiattack is just two Pseudopod attacks and an Engulf ability, but they can swap one attack out for Restraining Glob. The Pseudopods have a +15 to hit and deal an average of 24 damage each - which to be frank, is actually kind of low for a creature of this stature, but let's look at the other abilities:
Engulf can hoover-up any creature that it moves through, forcing a DC 23 Strength save. Creatures engulfed take 21 force damage each turn and are suffocating. As a reminder, suffocation inflicts temporary exhaustion each round, so while you get to repeat this save, it'll get harder each time. A creature reduced to 0 HP is instantly dissolved into ash and ejected into the Astral Sea. Given that you'll need True Resurrection anyway in order to bring back someone killed this way, the "ejected into the Astral Sea" part doesn't really make things any more difficult - it's more just kind of adding insult to injury.
Naturally, the obvious strategy (and still probably the right one) is to stay far enough away to avoid the Engulf ability and pelt this thing from range (its resistance to standard weapon damage also means that most martial characters will have a tough time doing significant damage to it anyway). However, its Restraining Glob is going to make this harder to achieve: it launches a blob of goo at a Large or smaller creature it can see within 600 feet, and if they fail a DC 23 Dex save, they take some token acid damage (18 on average, so not tiny but also not a ton for this CR) and the glob rolls 60 feet toward the Blob, restraining the creature inside. This only lasts until the end of the next turn, so if you're really staying hundreds of feet away, you'll potentially have some time to open up some more distance, but you'll probably need to use teleportation or dashes to keep out of the way.
The Blob can make Pseudopod and Restraining Glob attacks as legendary actions, and can speed up the digestion process once per round with Decay, dealing 14 average Necrotic damage to creatures engulfed by it.
So: let's talk encounter design.
Like basically all Titans, the obvious way to do this is to have the Blob act as a solo monster in some wide-open area. The Blob is probably trying to destroy anything in its path, and the obvious doomsday scenario with one of these is that it's going toward a major population center. In the DMG, we get an illustration of a hundreds-of-feet-tall Blob of Annihilation menacing Sharn in Eberron, a city of skyscrapers that is, as I understand it, kind of the equivalent of 1920s New York - and the Blob is taller than the buildings. The stakes, thus, are pretty clear, as this thing could kill millions.
Actually, we should talk about size: Gargantuan creatures are most often represented with a 4x4 square of 5-foot squares on a map. But technically, Gargantuan is actually 20x20 feet or larger. The Tarrasque, for example, is described as 70 feet long/tall, and so I generally would say it should be 14x14 squares on a standard battle map. This thing can potentially hold the corpse of a Tarrasque within it, so I'd say at minimum we're looking at something 100x100 feet, or 20x20 squares (on a standard Roll 20 map, which is 25x25 squares, this would take up the majority of the screen).
That size is relevant as to how many creatures it can sweep up in a single Engulf.
Now, in terms of XP, we're looking at 50,000. For a party of 5 players, that's a simple 10,000 xp per player. In a solo encounter, that's thus roughly a moderate encounter for 19th level players, or a hard encounter for 16th or 17th level players. Given that the hard difficulty is at that threshold, I think you could very appropriately use a Blob of Annihilation as a tier end boss for tier 3 - the monster they must defeat before graduating up to tier 4. As a caution, though: remember that tier 3 players will not have access to True Resurrection (though if they prevail and do level up, a Cleric or Druid in the party will gain access to it).
Indeed, I think it's somewhat fitting here because tier 3 is "heroes of the world," and what is a Blob of Annihilation other than a threat to the entire world?
Now, what about story?
The Blob itself, while of average humanoid intelligence, is probably not something that make much of a plan. Instead (and this works for other Titans) it's probably the beckoning or summoning of a Blob of Annihilation that makes up the ultimate end goal for an evil villain's plan. Nihilistic cultists who just want to see the total destruction of the world might summon one forth or release it from some ancient imprisonment.
It is also possible that there's no real malicious intent here - perhaps some well-intentioned Spelljamming explorers found some frozen specimen out in space and brought it back to study it, only for it to thaw out and become a menace.
I also think you could easily have a hubristic villain infuse themselves with some kind of deeply unstable magic and become something like this, losing their sense of self and their mind as they become this endlessly hungering creature.
As the entry in the book points out: these things often have interesting and valuable things stuck within them, so the Blob itself might be somewhat incidental - it might be something you need to fight just in order to retrieve the hidden key or artifact or monstrous remains inside of it.
Regardless of how you use it in your campaign, I recommend putting the theme to The Blob by Burt Bacharach on a loop while the party fight it.
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