Invincibility Mushroom

The Invincibility Mushroom is a mushroom item that appears in Captain Toad: Treasure Tracker. It makes the user invincible for an entire level and surrounds them with a white glow while doing so.

Captain Toad: Treasure Tracker/Captain Toad: Treasure Tracker (Nintendo Switch/Nintendo 3DS
If Captain Toad or Toadette lose enough lives in a level, an Assist Pluck Patch will appear containing an Invincibility Mushroom. Plucking it and collecting the mushroom will cause either Toad to glow, similar to a Super Star. However, the effect lasts until the end of the level, making it easier for them to deal with tough enemies, leaving any puzzles within the stage as the only remaining challenge(s). In the Nintendo 3DS and Nintendo Switch versions of the game, tapping a Toad amiibo on the level select screen is an additional way to get an Invincibility Mushroom. Using this method will automatically give the player the effects of the Invincibility Mushroom as soon as they enter a level; losing enough lives to get the Assist Pluck Patch to appear is not required. The Invincibility Mushroom item is very similar to the Invincibility Leaf item from Super Mario 3D Land, New Super Mario Bros. 2 and Super Mario 3D World.

Mario & Luigi:Superstar Saga + Bowser's Minions
An Invincibility Mushroom also appears in the Minion Quest mode of Mario & Luigi: Superstar Saga + Bowser's Minions. The Little Fungitown arcade proprietor bribes the Minions to fetch one from a cave in the mission Find the Invincibility Mushroom! However, since neither he nor Captain Goomba know what an Invincibility Mushroom looks like, the latter ends up picking a Poison Mushroom instead accidentally, which makes Mario succumb to Bean Fever later on.

Trivia

 * The color scheme of the Invincibility Mushroom comes from Invincible and Rainbow Mario's color scheme.

Captain Toad: Treasure Tracker

 * Instruction manual: "If you lose five lives on one course, an Assist Pluck Patch will appear. If you need some help getting through a course, pull it up to find an Invincibility Mushroom. Grabbing it will make you invincible!"
 * "This doesn't apply to courses you've already completed or those with no enemies."

Names in other languages
Unbesiegbarkeitspilz Fungo Invincibile