The Voidspawn Residue is a creature born from the convergence of countless planes of existence. Its existence is a paradox, as it simultaneously touches every plane and none at all. Its cilia vibrate with an eerie rhythm that seems to resonate with the underlying fabric of reality itself, and those who get too close can feel the unsettling sensation of their very existence being perforated by multiple planes simultaneously.

Scholars speculate that the voidspawn residue may be a remnant of a long-forgotten cosmic event, or perhaps the creation of some malevolent being who sought to transcend the boundaries of the multiverse. Regardless of its origins, encountering the voidspawn residue is a harrowing experience that leaves a lasting impression on all who witness its otherworldly form.

Armor Class 8
Hit Points 45 (6d10 + 12)
Speed 10 ft., climb 10 ft.

Saving Throws 
Skills 
Damage Resistances acid
Damage Immunities lightning, slashing
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
Languages --
Challenge 2 (450 XP)

Amorphous. The jelly can move through a space as narrow as 1 inch wide without squeezing.

Spider Climb. The jelly can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Actions

Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) bludgeoning damage plus 3 (1d6) acid damage.

Reactions

Split. When a jelly that is Medium or larger is subjected to lightning or slashing damage, it splits into two new jellies if it has at least 10 hit points. Each new jelly has hit points equal to half the original jelly’s, rounded down. New jellies are one size smaller than the original jelly.

Armor Class 8
Hit Points 22 (3d8 + 9)
Speed 10 ft., climb 10 ft.

Saving Throws 
Skills Stealth +2
Damage Resistances acid, cold, fire
Damage Immunities 
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
Languages --
Challenge 44928 (100 XP)

Amorphous. The ooze can move through a space as narrow as 1 inch wide without squeezing.

Corrode Metal. Any nonmagical weapon made of metal that hits the ooze corrodes. After dealing damage, the weapon takes a permanent and cumulative −1 penalty to damage rolls. If its penalty drops to −5, the weapon is destroyed. Nonmagical ammunition made of metal that hits the ooze is destroyed after dealing damage. The ooze can eat through 2-inch-thick, nonmagical metal in 1 round.

False Appearance. While the ooze remains motionless, it is indistinguishable from an oily pool or wet rock.

Actions

Pseudopod. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage plus 7 (2d6) acid damage, and if the target is wearing nonmagical metal armor, its armor is partly corroded and takes a permanent and cumulative −1 penalty to the AC it offers. The armor is destroyed if the penalty reduces its AC to 10.

Armor Class 7
Hit Points 85 (10d10 + 30)
Speed 20 ft., climb 20 ft.

Saving Throws 
Skills 
Damage Resistances 
Damage Immunities acid, cold, lightning, slashing
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
Languages --
Challenge 4 (1100 XP)

Amorphous. The pudding can move through a space as narrow as 1 inch wide without squeezing.

Corrosive Form. A creature that touches the pudding or hits it with a melee attack while within 5 feet of it takes 4 (1d8) acid damage. Any nonmagical weapon made of metal or wood that hits the pudding corrodes. After dealing damage, the weapon takes a permanent and cumulative −1 penalty to damage rolls. If its penalty drops to −5, the weapon is destroyed. Nonmagical ammunition made of metal or wood that hits the pudding is destroyed after dealing damage. The pudding can eat through 2-inch-thick, nonmagical wood or metal in 1 round.

Spider Climb. The pudding can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Actions

Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) bludgeoning damage plus 18 (4d8) acid damage. In addition, nonmagical armor worn by the target is partly dissolved and takes a permanent and cumulative −1 penalty to the AC it offers. The armor is destroyed if the penalty reduces its AC to 10.

Reactions

Split. When a pudding that is Medium or larger is subjected to lightning or slashing damage, it splits into two new puddings if it has at least 10 hit points. Each new pudding has hit points equal to half the original pudding’s, rounded down. New puddings are one size smaller than the original pudding.

Armor Class 6
Hit Points 84 (8d10 + 40)
Speed 15 ft.

Saving Throws 
Skills 
Damage Resistances 
Damage Immunities 
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
Languages --
Challenge 2 (450 XP)

Ooze Cube. The cube takes up its entire space. Other creatures can enter the space, but a creature that does so is subjected to the cube’s Engulf and has disadvantage on the saving throw. Creatures inside the cube can be seen but have total cover. A creature within 5 feet of the cube can take an action to pull a creature or object out of the cube. Doing so requires a successful DC 12 Strength check, and the creature making the attempt takes 10 (3d6) acid damage. The cube can hold only one Large creature or up to four Medium or smaller creatures inside it at a time.

Transparent. Even when the cube is in plain sight, it takes a successful DC 15 Wisdom (Perception) check to spot a cube that has neither moved nor attacked. A creature that tries to enter the cube’s space while unaware of the cube is surprised by the cube.

Actions

Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 10 (3d6) acid damage.

Engulf. The cube moves up to its speed. While doing so, it can enter Large or smaller creatures’ spaces. Whenever the cube enters a creature’s space, the creature must make a DC 12 Dexterity saving throw. On a successful save, the creature can choose to be pushed 5 feet back or to the side of the cube. A creature that chooses not to be pushed suffers the consequences of a failed saving throw. On a failed save, the cube enters the creature’s space, and the creature takes 10 (3d6) acid damage and is engulfed. The engulfed creature can’t breathe, is restrained, and takes 21 (6d6) acid damage at the start of each of the cube’s turns. When the cube moves, the engulfed creature moves with it. An engulfed creature can try to escape by taking an action to make a DC 12 Strength check. On a success, the creature escapes and enters a space of its choice within 5 feet of the cube.

Small ooze, unaligned

• Armor Class 10
• Hit Points 13 (3d6 + 3)
• Speed 10 ft., climb 10 ft.

• Damage Resistances acid
• Damage Immunities lightning, slashing
• Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
• Senses blindsight 60 ft. (blind beyond this radius), passive Perception 9
• Languages —
• Challenge 1 (200 XP)

Adhesive. The Oozing Limb can adhere to anything that touches it as a bonus action. A medium or smaller creature adhered to the Oozing Limb is also grappled by it (escape DC 12). Ability checks made to escape this grapple have disadvantage.

Amorphous. The Oozing Limb can occupy another creature’s space and vice versa and can move through a space as narrow as 1 inch wide without squeezing.

Spider Climb. The Oozing Limb can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Symbiotic Bond. The Oozing Limb bonds with a willing intelligent creature as an action to form an adaptive limb, responding to telepathic commands like the appendage it’s replacing. It secretes an adhesive to connect itself to its host and to hold objects. The acid secreted by the Oozing Limb will gradually ruin nonmagical wood, leather, cloth, and other materials softer than metal if used to hold them, snapping bow strings instantly.

    When attached to its host, the Oozing Limb functionally becomes part of the host, sharing the host’s hit points and other abilities like any other appendage. It gets no actions of its own, but the host can use its adhesive and pseudopod as unarmed attacks.

    The Oozing Limb can detach on command as a bonus action. While detached, it retains its link and can follow simple commands up to 30 feet away from its host. If it moves further away, it will attempt to return to its host but cannot sense it until within range. If separated from the host for 1 day, it will seek a new host.

Actions

Pseudopod. Melee Weapon Attack: +3 to hit, reach 10 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage plus 2 (1d4) acid damage.