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Oblex

Overview

By experimenting on the slimes, jellies, and puddings that infest the depths of the Underdark, mind flayers created a special breed of ooze, the oblex - a slime capable of assaulting the minds of other creatures. Cunning hunters, these pools of jelly stalk prey, searching for the memories they so desperately crave. When oblexes feed on those thoughts, sometimes killing their victims, they can form weird copies of their prey, which help them to harvest even more victims for their dark masters.  

Memory Eaters

Oblexes feed on thoughts and memories. The sharper the mind, the better the meal, so oblexes hunt obviously intelligent targets such as wizards and other spellcasters. When suitable fare comes within reach, an oblex draws its body up to engulf its victim. As it withdraws, it plunders the creature’s mind, leaving its prey befuddled and confused.  

Ooze Nature

An oblex doesn’t require sleep.    

Oblex Spawn CR: 1/4 (50 XP)

Tiny ooze, lawful evil
Armor Class: 13
Hit Points: 18 (4d4 + 8)
Speed: 20 ft

STR

8 -1

DEX

16 +3

CON

15 +2

INT

14 +2

WIS

11 +0

CHA

10 +0

Saving Throws: Int +4, Cha +2
Condition Immunities: Blinded, Charmed, Deafened, Exhausted, Prone
Senses: Blindsight 60 feet (blind beyond this distance), Passive Perception 12
Languages: None
Challenge Rating: 1/4 (50 XP)

Amorphous. The oblex can move through a space as narrow as 1 inch wide without squeezing.   Aversion to Fire. If the oblex takes fire damage, it has disadvantage on attack rolls and ability checks until the end of its next turn.

Actions

Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 feet, one target. Hit: 1d4 + 3 bludgeoning damage plus 1d4 psychic damage.

   

Adult Oblex CR: 5 (1,800 XP)

Medium ooze, lawful evil
Armor Class: 14
Hit Points: 75 (10d8 + 30)
Speed: 20 ft

STR

8 -1

DEX

19 +4

CON

16 +3

INT

19 +4

WIS

12 +1

CHA

15 +2

Saving Throws: Int +7, Cha +5
Skills: Deception +5, Perception +4, Arcana +7, History +7, Nature +7, Religion +7
Condition Immunities: Blinded, Charmed, Deafened, Exhausted, Prone
Senses: Blindsight 60 feet (blind beyond this distance), Passive Perception 14
Languages: Common plus two more languages
Challenge Rating: 5 (1,800 XP)

Amorphous. The oblex can move through a space as narrow as 1 inch wide without squeezing.   Aversion to Fire. If the oblex takes fire damage, it has disadvantage on attack rolls and ability checks until the end of its next turn.   Innate Spellcasting. The oblex’s innate spellcasting ability is Intelligence (spell save DC 15). It can innately cast the following spells, requiring no components:

  Sulfurous Impersonation. As a bonus action, the oblex can extrude a piece of itself that assumes the appearance of one Medium or smaller creature whose memories it has stolen. This simulacrum appears, feels, and sounds exactly like the creature it impersonates, though it smells faintly of sulfur. The oblex can impersonate 1d4 + 1 different creatures, each one tethered to its body by a strand of slime that can extend up to 120 feet away. For all practical purposes, the simulacrum is the oblex, meaning that the oblex occupies its space and the simulacrum’s space simultaneously. The slimy tether is immune to damage, but it is severed if there is no opening at least 1 inch wide between the oblex’s main body and the simulacrum. The simulacrum disappears if the tether is severed.

Actions

Multiattack. The oblex makes one pseudopod attack and eats memories.   Pseudopod. Melee Weapon Attack: +7 to hit, reach 5 feet, one target. Hit: 1d6 + 4 bludgeoning damage plus 2d4 psychic damage.   Eat Memories. The oblex targets one creature it can see within 5 feet of it. The target must succeed on a DC 15 Wisdom saving throw or take 4d8 psychic damage and become memory drained until it finishes a short or long rest or until it benefits from the greater restoration or heal spell. Constructs, oozes, plants, and undead succeed on the save automatically. While memory drained, the target must roll a d4 and subtract the number rolled from any ability check or attack roll it makes. Each time the target is memory drained beyond the first, the die size increases by one: the d4 becomes a d6, the d6 becomes a d8, and so on until the die becomes a d20, at which point the target becomes unconscious for 1 hour. The effect then ends. When an oblex causes a target to become memory drained, the oblex learns all the languages the target knows and gains all its proficiencies, except for any saving throw proficiencies.

   

Elder Oblex CR: 10 (5,900 XP)

Huge ooze, lawful evil
Armor Class: 16
Hit Points: 115 (10d12 + 50)
Speed: 20 ft

STR

15 +2

DEX

16 +3

CON

21 +5

INT

22 +6

WIS

13 +1

CHA

18 +4

Saving Throws: Int +10, Cha +8
Skills: Arcana +10, Deception +8, History +10, Nature +10, Perception +5, Religion +10
Condition Immunities: Blinded, Charmed, Deafened, Exhausted, Prone
Senses: Blindsight 60 feet (blind beyond this distance), Passive Perception 15
Languages: Common plus six more languages
Challenge Rating: 10 (5,900 XP)

Amorphous. The oblex can move through a space as narrow as 1 inch wide without squeezing.   Aversion to Fire. If the oblex takes fire damage, it has disadvantage on attack rolls and ability checks until the end of its next turn.   Innate Spellcasting. The oblex’s innate spellcasting ability is Intelligence (spell save DC 18). It can innately cast the following spells, requiring no material components:

  Sulfurous Impersonation. As a bonus action, the oblex can extrude a piece of itself that assumes the appearance of one Medium or smaller creature whose memories it has stolen. This simulacrum appears, feels, and sounds exactly like the creature it impersonates, though it smells faintly of sulfur. The oblex can impersonate 2d6 + 1 different creatures, each one tethered to its body by a strand of slime that can extend up to 120 feet away. For all practical purposes, the simulacrum is the oblex, meaning the oblex occupies its space and the simulacrum’s space simultaneously. The slimy tether is immune to damage, but it is severed if there is no opening at least 1 inch wide between the oblex’s main body and the simulacrum. The simulacrum disappears if the tether is severed.

Actions

Multiattack. The elder oblex makes two pseudopod attacks and eats memories.   Pseudopod. Melee Weapon Attack: +7 to hit, reach 10 feet, one target. Hit: 4d6 + 3 bludgeoning damage plus 2d6 psychic damage.   Eat Memories. The oblex targets one creature it can see within 5 feet of it. The target must succeed on a DC 18 Wisdom saving throw or take 8d10 psychic damage and become memory drained until it finishes a short or long rest or until it benefits from the greater restoration or heal spell. Constructs, oozes, plants, and undead succeed on the save automatically. While memory drained, the target must roll a d4 and subtract the number rolled from any ability check or attack roll it makes. Each time the target is memory drained beyond the first, the die size increases by one: the d4 becomes a d6, the d6 becomes a d8, and so on until the die becomes a d20, at which point the target becomes unconscious for 1 hour. The effect then ends. When an oblex causes a target to become memory drained, the oblex learns all the languages the target knows and gains all its proficiencies, except any saving throw proficiencies.

Lifespan
Immortal
Average Weight
18,000 pounds
Average Length
15 feet

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