The Sinister Plant is a harder variation of the Sterile Plant (unlockable from a Scientist's quest in the main story). The Sinister Plant includes enemies such as the Retroputer and the Brand-New Robot. The building includes a grated metal floor and a red fog and impending atmosphere, as well as long gray wires and small, faceless "Traveler"puters hanging from the ceiling.
This dungeon is first properly introduced via one of the mandatory post-game quests from the Travelers' Hub.
Contents
Monsters
Level 20-29 quests
- Retroputer
- Fossil
- Deadly Demon
- Brand-New Robot
- Bloon Loon Loon
- Hamburger Surprise (possible boss)
Level 30-39 quests
- Fossil
- Licorice Jelly
- Retroputer
- Brand-New Robot
- Very Dangerous Bomb
- Ice Coolman
- Deadly Demon
- Puppetmaster
- Dark Medusa
- "Traveler's Friend" Slime (possible boss)
- "Traveler" UFO (possible boss)
- "Traveler" Bread (possible boss)
- "Traveler" Mouse (possible boss)
- "Traveler" (possible boss)
- Red "Traveler's Friend" Golem (possible boss)
- Red Dragon (possible boss)
Level 40-49 quests
- Licorice Jelly
- Iron General
- Terror Fiend
- Clever Running Nose
- Moldy Mummy
- Heavy Hammer
- Rare Snurp (on the map)
- Arachno"Traveler" (possible boss)
- "Traveler"puter (possible boss)
- Gold "Traveler's Friend" Golem (possible boss)
- Wind Queen "Traveler" (possible boss)
- Ancient Robot (possible boss)
Level 50 quests
- Terror Fiend
- Ancient Robot
- Retroputer II
- Black Snurp
- Roll Hopper
- Doo-Whopper
- "Traveler" Wind (possible boss)
- "Traveler's Friend" Bread (possible boss)
- "Traveler" & Orochi (possible boss)
- "Traveler" UFO (possible boss)
- "Traveler's Friend" (possible boss)
- Lizard”Traveler’s Friend”man
Areas around Sinister Plant
- Nimbus (west)
- Sterile Plant (north)
- Sterile Plant 2.0 (north-east; Random Dungeon)
Trivia
- This is one of the random dungeons that have their own unique name.
- This is one of the random dungeons that have their own unique design.
- This is also one of the few random dungeons with their own stage music.
- If the player saves and quits in the Sinister Plant, static noises can be heard on the title screen alongside the Nimbus music.
Gallery
Introduction screen in the 3DS version.
Exploring the Sinister Plant.
Example of a dungeon layout in Sinister Plant. (3DS version)
Example of a dungeon layout in Sinister Plant. (Nintendo Switch version)
Sinister Plant's location. (3DS version)
Background for Sinister Plant.
 List of Locations in Nimbus
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 Sinister Plant | ||||
