Biweekly Monster-Rainbow Gel

RainbowGel

This morning I asked my daughters for help creating a monster to post today. They thought it should be rainbow colored and cube shaped. Well, that was all the inspiration I needed. I present the Rainbow Gel, a Gelatinous Cube* that instead of acid damage has effects from the Prismatic Spray* spell.

Created by a mad mage who wanted something a little more flashy to process his sewage and guard that approach, these magical cubes keep things much cleaner than the standard model.

Rainbow Gel
Large ooze, unaligned
Armor Class: 6
Hit Points: 84 (8d10+40)
Speed: 15 ft.

STR DEX CON INT WIS CHA
14 (+2) 3 (-4) 20 (+5) 1 (-5) 6 (-2) 1 (-5)

Condition Immunities: blinded, charmed, deafened, exhaustion, frightened, prone
Languages: –
Challenge: 3 (700 XP)

Ooze Cube. The gel takes up its entire space. Other creature can enter the space, but a creature that does so is subjected to the gel’s Engulf and has disadvantage on the saving throw.
Creatures inside the gel can be seen but have total cover.
A creature within 5 feet of the gel can take an action to pull a creature or object out of the gel. Doing so requires a successful DC 12 Strength check, and the creature making the attempt suffers an effect from the Rainbow Table.

Semi-Transparent. Even when the gel is in plain sight, it takes a successful DC 12 Wisdom (Perception) check to spot a gel that has neither moved not attacked. A creature that tries to enter the gel’s space while unaware of the gel is surprised by the gel.
Actions
Psuedopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: effect from the Rainbow Table.
Engulf. The gel moves up to its speed. While doing so, it can enter Large or smaller creature’s spaces. Whenever the gel 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 back 5 feet back or to the side of the gel. A creature that chooses not to be pushed suffers the consequences of a failed saving throw.
On a failed save, the gel enters the creature’s space, and the creature suffers an effect from the Rainbow Table and is engulfed. The engulfed creature can’t breathe, is restrained, and suffers two effects from the Rainbow Table at the start of each of the gel’s turns. When the gel 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 gel.

Rainbow Table
Roll 1d8 each time an effect from this table is triggered to determine which color of the Rainbow Gel contacts the victim.
1. Red. The target takes 10 (3d6) fire damage.
2. Orange. The target takes 10 (3d6) acid damage.
3. Yellow. The target takes 10 (3d6) lightning damage.
4. Green. The target takes 10 (3d6) poison damage.
5. Blue. The target takes 10 (3d6) cold damage.
6. Indigo. The target is restrained. It must then make a DC 12 Constitution saving throw at the end of each of its turns. If it successfully saves three times, it is no longer restrained. If it fails its save three times, it permanently turns to stone and is subjected to the petrified condition. The successes and failures don’t need to be consecutive; keep track of both until the target collects three of a kind.
7. Violet. The target is blinded. It must then make a DC 10 Wisdom saving throw at the start of your next turn. A successful save ends the blindness. If it fails that save, the creature is transported to another place of existence of the GM’s choosing and is no longer blinded. (Typically, a creature that is on a plane that isn’t its home plane is banished home, while other creatures are usually cast into the Astral or Ethereal planes.)
8. Special. The target is touched by two colors. Roll twice more, rerolling any 8.

*Gelatinous Cube and Prismatic Spray can both be found in the Systems Reference Document.

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