A giant, vaguely humanoid mushroom that walks around with a sign written in common that says “CHALLENGE ME.”¹⁾ Mushroom Guy was extremely competitive about three things initially: arm-wrestling, staring contests, and naming the most different kinds of something or other. Winning a contest against Mushroom Guy usually results in him giving someone 47 gold pieces for some unknown reason. But partaking in a contest against Mushroom Guy also requires putting up that much gold or some interesting collateral. Mushroom Guy is considered to be Lawful Neutral, meaning he respects the rules of challenges and doesn't have an alternate agenda, at least not when he first entered the campaign. At worst he seems a little smug and does intimidating arm flexes.

• Mushroom Guy first encountered The Party along the roads of the Hylund region. Initially they dodged him but he ended up bumping into them on location after they first met Gorm.
  • Several contests ensued, and Mushroom Guy won them all: Arm-Wrestling²⁾, Staring Contest³⁾, and a naming contest where Mushroom Guy bested Urist in being able to name more cheeses.⁴⁾
  • The Party tricked him into trying to solve a riddle written on a nearby tree as another challenge. He won this by solving the riddle. This showed that Mushroom Guy can probably be prompted to take anything as a challenge.
  • Ultimately Mushroom Guy walked away having earned over 100 gold pieces and the Jesus Syringe.
• Mushroom Guy was present when Gorm was told about Walker Florida Cleric's dojo.