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The 2024 Monster Manual is more than just a revamp to the monsters you know and love. Not only does the latest edition of the Monster Manual come with over 500 unique and revamped creations, but it also comes with 75 completely brand-new monsters never before seen in Dungeons and Dragons history. The most notable of the recent inclusions is the Blob of Annihilation, a gargantuan creature with an impressive stat block that comes in at a whopping CR 23.

Already taking the community by storm with its apocalyptic levels of horror, the Blob of Annihilation is quickly becoming a quintessential high-level enemy for parties far and wide. A welcome addition for those who felt the previous Monster Manual lacked monsters of higher Challenge Rating, the Blob of Annihilation is an enemy creature with a wealth of abilities, tactics, and backstory. Build an entire campaign around it, or throw it at your players out of the blue and watch them scramble to Misty Step away as they try to escape the clutches of Wizards of The Coast's take on "The Blob."

In this complete guide to the Blob of Annihilation, we'll explore:

• How to run the Blob of Annihilation in your campaign
• Tactics and encounter strategies
• The Blob's terrifying origins and lore
• Possible connections to other legendary entities

Tips for Running A Blob of Annihilation:

Quick Stats

AC 18

HP 448

Resistances: Bludgeoning, Piercing, Slashing

Immunities: Acid, Necrotic, Poison; Charmed, Exhaustion, Frightened, Grappled, Paralyzed, Petrified, Poisoned, Prone, Restrained, Stunned, Unconscious

Legendary Resistance (4/Day). If the Blob fails a saving throw, it can choose to succeed instead.

Know What You're Up Against

Dungeons and Dragons is a game of unimaginable outcomes, and when going up against a multiversal entity, the more prep you can do, the better. Before your players decide to take on a Blob of Annihilation, you might want them to be clear about what they hope to achieve.

Unlike most monsters in the Monster Manual, the Blob of Annihilation can't be killed.

Your party can bring the creature down to 0HP, triggering it to implode and disappear from existence, but fair warning: In (1d20) years, the Blob will return. Reappearing on a random world in the Material Plane, ready to consume again.

Path of Annihilation

The 2024 Monster Manual describes the Blob of Annihilation as "a coagulation of cosmic entropy conjoined to the remains of dead gods. This malicious entity drifts through Wildspace and multiversal expanses inimical to life—vast regions where the chance of encountering it is low".

In short, the Blob is an undead entity of the most tremendous forces across the multiverse, reincarnated to consume everything in its path. A cosmic blight with the ability to eat entire lands, absorbing anything and anyone in its way. The only thing it won't eat is magic items.

Don't get Engulfed

Another critical factor to consider when your party decides to take on a Blob of Annihilation is the multiversal abilities innate to its form. Anybody inside a Blob of Annihilation is ejected into the Astral Plane upon death.

The unique abilities of a Blob of Annihilation force your players to approach their typical BBEG fight a little differently. 

DM Tip: If your party plans to take it down from the inside, ensure they have an exit strategy.

Blob of Annihilation Fight Tactics

Designing The Encounter

Setting the scene is half the fight. These tips will help you push the odds in whoever's favor you choose.

Make it Harder on Your Players: 

Force Them Into its Path: A Blob of Annihilation is a massive, gargantuan creature that demolishes everything in its path like a geological bulldozer. When confronted by this monstrous entity, anything under 20 feet tall—whether a sturdy tree or a solid wall—becomes instant collateral damage.

Surprise Them With Difficult Terrain: Lead the players into small areas of Difficult Terrain, giving the Blob enough time to engulf the party's healers with their Restraining Glob or Engulf moves.

Make it Easier on Your Players:

Magical Items as Cover: A Blob of Annihilation can only destroy non-magical items, so while it might be able to engulf a player, it won't be able to hurt them if they're contained within something magical. Throw in pockets of the terrain protected by magical barriers or start them near protective magic items like Instant Fortress or a scroll of Mordenkainen's Private Sanctum (Scrolls are Magic Items, too.)

Elevate the Party: With a speed of 30ft, the Blob of Annihilation isn't particularly fast, and its massive size makes it hard for the creature to climb heights. Let the players use this to their advantage by having ranged characters take higher positions for advantage against the Blob. But make sure they know about the reach of its Restraining Glob (600ft).

Plan The Fight

Let your party consider their tactics so they can hit this CR23 creature with everything they've got.

Heals Over Time: The party needs someone to provide heals over time. Blob fights are guaranteed to be epic, and players are likely to be engulfed individually, meaning people will constantly need healing for as long as possible. Good party members to fill this role are Life Domain Clerics,  who get extra hp on every spell they cast thanks to their Disciple of Life ability, or the Oath of the Crown Paladin, whose Aura of Vitality grants healing to an ally within 30ft.

Target its Weaknesses: The Blob is slow and devoid of emotion or personality, meaning it has weaker Dex, Int, Wis, and Cha scores. Spellcasters planning to fight the Blob should pick a loadout that targets its weaknesses. While the Blob is immune to most conditions, it can still take the damage.

Decide if You're Drawing Focus or Spreading Buffs: Let the party choose between focusing defenses on a single tank or distributing protective magic across the party. A tank strategy involves a durable character absorbing attacks as ranged allies strike from afar, while the group approach uses collective healing and defensive spells. Success depends on adapting tactics to the terrain and leveraging each character's strengths against this overwhelming threat.

Origin of the Blob

The history behind the creation of the Blob of Annihilation is one of the most promising. While it's always nice to uncover hundreds of years of lore baked into the backstory of a monster, there's a certain charm to a creature that exists simply because the designers were excited about the idea. One such monster is the Blob of Annihilation, which was ideated by lead designer Jeremy Crawford himself, whose entire approach is structured around a "play first" philosophy. With the 2024 Monster Manual, designers were encouraged to develop creatures they wanted to see as players first and foremost, and for Jeremy, it was the Blob of Annihilation.

Possible Relatives of the Blob of Annihilation

Sphere of Annihilation: There are no direct predecessors to the Blob of Annihilation in previous editions of Dungeons and Dragons sourcebooks. Still, the Sphere of Annihilation (sometimes called the Orb of Annihilation) is thematically similar. Much like the Blob, the Sphere is a multiversal omen of bad things to come. The 2024 Dungeon Masters guide states the "2-foot-diameter black sphere is a hole in the multiverse, hovering in space and stabilized by a magical field surrounding it." and goes on to describe its ability to "obliterate" any matter that passes through it, with an exception for artifacts, which pass through the Sphere unscathed. Perhaps intentionally, multiversal creatures' backstories are kept vague beyond the general origin of the "cosmos." However, given their similar names and abilities, one could argue that the Blob and Sphere of Annihilation might've been born from the same source or creator.

Turn the Tables: What happens when a Blob of Annihilation swallows a Sphere of Annihilation? Does the Sphere obliterate the Blob as it tries to pass through it? Or does the Blob blow up? Sending the Sphere and the surrounding creatures into a random plane of existence? There's only one way to find out.

Gelatinous Cube: Everyone's favorite, the Gelatinous Cube, is less likely to be as directly correlated but still worth mentioning as a possible predecessor to the Blob of Annihilation.  While this CR2 creature can't "obliterate" any mass that passes through it, it can still engulf targets like the Blob of Annihilation. If they aren't directly related, the Gelatinous Cube would at least serve as a good minion of the Blob, perhaps acting as its scout as it seeks more life for its superior counterpart to consume.

Unleash the Blob of Annihilation Today

Ready to unleash cosmic destruction in your next campaign? The Blob of Annihilation awaits in the Roll20 digital marketplace. Unlock the 2024 Monster Manual—your gateway to introducing this terrifying, landscape-devouring entity into your tabletop adventures and with just a few clicks, you can transform your next session from ordinary to extraordinary, giving your players an unforgettable encounter with a creature that doesn't just challenge their combat skills, but completely reimagines the battlefield itself. Grab your digital copy today and prepare to annihilate your players' expectations!