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King Shroomus
Health 1800 (♥×900)
Size Width: 0.875 blocks
Height: 3.25 blocks
Damage 20 (♥×10)
Environment Mysterium
Hostility Hostile
XP Xp Orb.png 189
ID aoa3:king_shroomus
Version added 1.1

King Shroomus (AKA The Mushroom Monster) is the only boss in Mysterium. He is spawned by dropping a Shroom Stone in Mysterium and waiting for a few seconds.


King Shroomus is a ranged boss that will fire projectiles at the player at a moderate pace. Upon hit, the player is inflicted with one of four debuffs:

  • Slowness III for 4 seconds
  • Poison V for 4 seconds
  • Nausea CI (Nausea 101) for 7 seconds
  • Weakness III for 5 seconds

King Shroomus has a 1 in 200 chance per world tick to regenerate a portion of his health. He regenerates at a rate of 2 (♥×1) health per world tick for 4 seconds.


Entity loot
Item Quantity Chance
Nothing - 67.6%
Shroomus Sword.pngShroomus Sword 1 18.9%
Fungal Staff.pngFungal Staff 1 13.5%
The above pool is rolled 1 time
Nothing - 12.8%
Magic Repair Dust.pngMagic Repair Dust 1-3 7.7%
Silver Coin.pngSilver Coin 1-5 8.9%
Gold Coin.pngGold Coin 1-2 3.8%
Enchanted Gunpowder.pngEnchanted Gunpowder 1 5.1%
Poison Rune.pngPoison Rune 6-20 10.2%
Life Rune.pngLife Rune 6-20 10.2%
Water Rune.pngWater Rune 6-20 10.2%
Mystic Shrooms.pngMystic Shrooms 1-4 7.1%
Red Mushroom.pngRed Mushroom 8-32 8.2%
Brown Mushroom.pngBrown Mushroom 8-32 8.2%
Mushroom Stem.pngMushroom Stem 1-6 7.7%
The above pool is rolled 1-2 times
Trophy.pngKing Shroomus Trophy 1 100.0%
The above pool is rolled 1 time
Mysterium Table 1 100.0%
The above pool is rolled 1 time

Related Advancements[]

Icon Name Description Obtaining Parent ID Hidden
Advancement challenge bg.pngTrophy.png Shroomed! Defeat King Shroomus, the mushroom monster See description It's Not What It Looks Like! aoa3:mysterium/shroomed No