Medium Ooze, Neutral Evil
Armor Class 7 Natural Armor
Hit Points 158 (20d8 + 50)
Speed 25 ft., Can walk on walls and ceilings.
STR
17 (+3)
DEX
11 (+0)
CON
17 (+3)
INT
11 (+0)
WIS
14 (+2)
CHA
15 (+2)
Saving Throws CON +7
Skills Intimidation +1, Stealth +4
Damage Vulnerabilities Acid
Damage Resistances Bludgeoning, Fire, Force
Damage Immunities Poison, Psychic
Condition Immunities Blinded, Charmed, Frightened, Poisoned, Prone, Unconscious
Senses Blindsight 70 ft, Passive Perception 14
Languages --
Challenge 12 (8,400 XP)
Proficiency Bonus +4
Traits

You Are What You Eat. The Black Sludge can utilize any armor consumed by it to its advantage, if a Black Sludge consumes a piece of light armor, it gets a +1 to its AC. If it consumes a piece of Medium Armor, +2. Likewise, a piece of heavy armor, +3. If it consumes a piece of magical armor, there is a 55% chance it will gain the armor's effects.

Horrid Ooze. The Black Sludge emits a foul stench, and any creatures within 40 ft of it must make a DC 11 Saving Throw or be stunned on their next turn. The Black Sludge literally absorbs its prey, and until its prey is dissolved, which takes about 1 day, its prey it jammed within its body.

Slimy and Slippery. The Black Sludge can fit into a space one size smaller than it, and it its wake it leaves a black slime trail, and if a creature walks on it, it must make a DC 8 Dexterity Check or be slip and be knocked prone.

Filthy Mass. When the Black Sludge makes a ranged attack, and if its target is hit, there is a 15%-25% chance (per DM's discretion) that the target will get infected with "Sludge Cancer" (see "Carrier of Plague).

Carrier of Plague. The Black Sludge has an innate sickness that it carries, and can pass it on to other creatures. If a creature is infected, it loses 1 HP every hour, and after 3 hours of being infected, is deafened, after 5 hours of being infected, suffers 3 levels of exhaustion, and after 1 hour of being infected, must consume twice as much food and drink per day. After 7 hours of infection, is blinded, suffers 4 levels of exhaustion, is frightened, is unable to sleep, and dies when HP reaches zero. 

Frenzied Death Throes. When a Black Sludge is killed, there is a 70% chance that it will explode. If this happens, its bodily substance will splatter all over the place for 25-30 ft in all directions. Any creatures within this radius must make a DC 18 Dexterity Check, be completely behind a solid object (ie. Rock, Wall, etc.) or be hit. If a creature is hit, it must make a DC 6+ Saving Throw or be infected with "Sludge Cancer".

Actions

Consuming Sludge. The Black Sludge is made of an acidic gelatin-like substance, and any creature that touches it will be dealt 1d4-1 acid damage.

Forceful Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 1d6+1 bludgeoning damage. The Black Sludge slams its prey against a wall.

Filthy Splatter. Ranged Weapon Attack: +3 to hit, range 5/15 ft., 1 target. Hit: 1d8 Acid damage. A disgusting and hazardous splatter.

Corroding Spit. Ranged Weapon Attack: +6 to hit, range 5/30 ft., 1 target. Hit: 1d10 Acid damage. The Black Sludge spits a deadly and sickly wad of filth.

Reactions

Deathly Breath (3/Day). As a reaction, the Black Sludge can release a sort of breath that emanates from its body. This is a black, smoke-like substance, and any creatures within 20 feet must make a DC 8 Saving Throw or suffers one level of exhaustion. There is also a  10%-20% chance (per DM's discretion) that any affected creatures will become paralyzed for the next 2 rounds.

Legendary Actions

The Black Sludge can take 1 legendary action. The Legendary Action can be taken only at the end of another creature's turn. The Black Sludge regains  the spent legendary action at the start of its turn.

Forceful Slam (Costs 2 Actions). The Black Sludge makes its Forceful Slam attack.

Description

There are few creatures more revolting, disgusting, and downright terrifying than the Black Sludge. The first one was the result of a spell gone wrong. A Dark Elf wizard by the name of Jradstyrr Drae'Krazzdrok attempted to create a spell in which the creature under its effects would be able to morph shape in order to fit into smaller spaces. The spell went horribly wrong, and the unfortunate kobold that was Jradsytrr's guinea pig underwent horrible transformation and became the first of this abominable species. No one knows how Black Sludge's multiply, and no one want to know. They resemble a roughly square-shaped mass of black, filthy ooze. The black filth that it is consisted of has a slight shimmer to it and is very toxic. They have no discernible eyes, mouth, ears, or nose, but have decent blindsight. They live in subterranean environments, and require dark, damp, living conditions. They abhor sunlight, and if exposed to it are blinded and have disadvantage on attack rolls.

Lair and Lair Actions

The lair of a Black Sludge is usually a pit or something similar, and is usually littered with skeletons, armor, weapons, and random objects. Black Sludge lairs are almost always damp, and have little to no light.

Habitat: Underdark

KavrathTheDark

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