Armor Class
18
Blob of Annihilation
Gargantuan Ooze · Neutral Evil
Hit Points
448 (23d20 + 207)
Speed
Walk 30 ft.
CR
23
Traits
Astral Implosion
If the blob is reduced to 0 Hit Points, it implodes and ejects any creatures and objects engulfed by it into the Astral Sea. The blob itself vanishes, leaving behind a layer of slime on everything that was within 600 feet of it. In years, the blob reconstitutes on a random world in the Material Plane.
Legendary Resistance (4/Day)
If the blob fails a saving throw, it can choose to succeed instead.
Magic Resistance
The blob has Advantage on saving throws against spells and other magical effects.
Actions
Multiattack
The blob makes two Pseudopod attacks and uses Engulf. It can replace one attack with a use of Restraining Glob.
Pseudopod
Melee Attack +15, reach 30 ft. 24 () Force damage.
ForceEngulf
The blob moves up to its Speed and can move through the spaces of Huge or smaller creatures and objects. STR Save DC 23, each creature or object whose space the blob enters for the first time during this move.
Failure: The target is engulfed. While engulfed, a target has Cover against attacks and other effects outside the blob, and when the blob moves, the engulfed target moves with it. A nonmagical object is destroyed after spending 1 minute engulfed.
While engulfed, a creature takes 21 () Force damage at the start of each of its turns, is suffocating, has the condition, and repeats the save at the end of each of its turns. An engulfed creature that is reduced to 0 Hit Points dissolves into ash, which is ejected into the Astral Sea.
Success: The target escapes and enters the nearest unoccupied space.
Failure: The target is engulfed. While engulfed, a target has Cover against attacks and other effects outside the blob, and when the blob moves, the engulfed target moves with it. A nonmagical object is destroyed after spending 1 minute engulfed.
While engulfed, a creature takes 21 () Force damage at the start of each of its turns, is suffocating, has the condition, and repeats the save at the end of each of its turns. An engulfed creature that is reduced to 0 Hit Points dissolves into ash, which is ejected into the Astral Sea.
Success: The target escapes and enters the nearest unoccupied space.
Restraining Glob
The blob lobs a slimy glob at one Large or smaller creature it can see within 600 feet of itself. DEX Save DC 23, the targeted creature.
Failure: 18 () Acid damage. The glob rolls the target 60 feet straight toward the blob, and the target has the condition until the end of its next turn, when the glob harmlessly dissolves.
Success: Half damage only.
Failure: 18 () Acid damage. The glob rolls the target 60 feet straight toward the blob, and the target has the condition until the end of its next turn, when the glob harmlessly dissolves.
AcidSuccess: Half damage only.
Legendary Actions
Decay
The blob deals 14 () Necrotic damage to each creature engulfed by it. The blob can't take this action again until the start of its next turn.
NecroticGrasping Glob
The blob uses Restraining Glob. The blob can't take this action again until the start of its next turn.
Lashing Goop
The blob makes one Pseudopod attack.