D/D swirl slime

From Yugioh; By konami

A seashell-shaped creature containing a mutagenic slime. Physically weak, it relies on magic to defend itself. Just dont let if fuse with one of it's archetypal allies.

Basic Information

Anatomy

A conical spiral shell-like creature that contains a viscous slime.

Growth Rate & Stages

It is always growing more slime, making it leave a green trail wherever it goes.

Dietary Needs and Habits

It feeds on algae and small bugs, which are absorbed into the acidic mutagen.

Additional Information

Facial characteristics

a red pupiled eye floating in the slime seems to signify some sort of 'face'

Average Intelligence

Unknown-possibly mindless.

Perception and Sensory Capabilities

Darkvision 40ft, blindsight 10ft

Tiny Fiend (demon any non-good alignment
AC: 6, MOV 0 (20ft float), HP: 2 (1d4)
STR: 1, DEX: 1, CON: 5, INT: 1, WIS: 16, CHR: 10 
Challenge: 0 (10exp)

Features:
Damage immunities: acid, darkness, water, necrotic, radiation, psychic.
Damage vulnerabilities: Radiant
Fusionist: If this creature is next to another  friendly 'D/D' or 'D/D/D' creature that is willing; It may use its bonus action to make a DC 18 wisdom check. On a success, it may fuse with that D/D creature to fusion summon an applicable D/D/D fusion monster of the lowest possible CR.

Average Height

0.5-.08ft

Average Physique

Has none; relies on instinctual magic to act for it.

Body Tint, Colouring and Marking

Blue shell with cold armour plates bolted on, with green slime.

Attacks:
 
This creature uses wisdom as it's to hit modifier.
Mutating goop: Ranged weapon attack, +5 to hit, range 20ft. Hit: 1 Radiation damage
Acidic goop: Ranged weapon attack, +5 to hit, range 30ft. Hit: 1 Acid damage
Poisonous  mist: melee weapon attack, +5 to hit, range ft. Hit: 1 poison damage

Loot:
1x Fiendish essence (15%), 1x Fusion Polymer (10%), 1x Summon ticket A (8%), 1x Different / Dimension candle (5%)