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Once frequented by the lords and ladies of the island, they often noted that some of the mushrooms seemed to shrink from their presence.
Dappled light, soothing fountains and a fresh air brought the royals, aristocratic and various hangers-on. Unfortunately they brought the stink of the Royal Court with them...
Earthy smells of compost, spores and decay fill the air of the dilapidated Arboretum. The new inhabitants seem to like the climate quite a bit.

Arboretum flag

The Dilapidated Arboretum is a second level biome that is exclusive to the Bad Seed DLC. Dappled light, soothing fountains and a fresh air brought the royals, aristocratic and various hangers-on to the gardens and serres of the arboretum to escape the hustle and bustle of the castle to have some moments of peace and relaxation.

However, the fragrance of their perfumes had, unbeknownst to them, disturbed the local flora and fauna. Now the arboretum, a shadow of its former glory, attracted a different kind of visitor, who enjoyed the earthy smells of compost, spores and decay very, very much.

General information[]

Access and exit[]

The Arboretum can be accessed from the Prisoners' Quarters via a Teleportation Rune IconTeleportation Rune after having first accessed the area with the Dilapidated Arboretum KeyDilapidated Arboretum Key.

There are three exits out of the Arboretum, which consist of the Prison Depths (requiring a Spider rune), the Morass of the Banished, and the Ramparts.

Level characteristics[]


The Dilapidated Arboretum contains 3 scrolls, including 1 Power Scrolls, and 2 Dual-Stat Scrolls, which cannot spawn in areas requiring the use of runes to access. On (1+ BSC) there is a bonus Power scroll. When 3 Boss Stem Cells are active, this biome has 1 guaranteed Scroll Fragment, and when 4/5 Boss Stem Cells are active, this biome has 2 guaranteed Scroll Fragments.

Enemy tier and gear level scaling[]

Difficulty Normal Hard Very Hard Expert Nightmare/Hell
Gear level II II II III V
Enemy lvl tier 3 - 6 4 - 10 5 - 10 7 - 11 8 - 12
Enemy Health tier Base 5 - 8 9 - 13 11 - 14 12 - 16

Loot and shops[]

Main level[]

Boss Stem Cells rewards[]

  • 1 BSC: Gear Shop
  • 2 BSC: Cell Vat
  • 3 BSC: Treasure chest
  • 4 BSC: Treasure chest

Exclusive blueprints[]

The following blueprints can only be found in the Arboretum as one is found in a lore room and four are looted from enemies that are exclusive to this area.


In the Arboretum you will find two unique enemies, the Yeeters and Jerkshrooms.

The table below lists which enemies are present in the Dilapidated Arboretum on each difficulty level and which blueprints each may drop. When applicable, the minimum difficulty level for blueprint acquisition is specified.

Enemy Normal Hard Very Hard Expert Nightmare/Hell
Zombie Blood Sword, Double Crossb-o-matic, Bobby Outfit (1 BSC)
Yeeter Flashing Fans, Mushroom King Outfit (3+ BSC)
Jerkshroom Mushroom Boi!, Mushroom Boi's Outfit (1+ BSC)
Thorny Spiked Boots, Barnacle, Armadillopack
Bat Knife Dance, Oiled Sword
Impaler Sadist's Stiletto
Oven Knight Kill Rhythm, Oven Axe
Rampager Adrenaline
Buzzcutter Spite Sword, Frostbite


Botanical beaker room[]

Botanical Beaker

The botanical beaker in the middle of the room.

The room depicted in the following picture contains three items that can be examined:


A letter written by an unknown person, presumably some sort of guard:

  • "Apparently seeing the dead rise wasn't enough.
  • "Today it's the plants that are up and raising hell."
  • "The King's new best friend has ordered one of them captured... Alive..."
  • "...I'd like to see that!"

Botanical beaker[]

A large glass container filled with some sort of rotting corpse.

  • "How did they get the skeleton in the bottle?"


A stack of books can be found laying nearby.

  • "“Man vs Wild” and other botanical treatises are spread out on the ground."
  • "I wonder what's in this flask..."

Giant tree room[]

Trunk Lore

The giant tree with a victim and a broken flask.


A large tree that appears to have various pieces of flesh and skeletons shoved into a hole in its side.

  • "It seems like these infected ones were trapped in the trunk..."
  • "Makes you wonder who was the sick one in this story..."


Beside the tree there is a glass container containing a large bird skull.

  • "The skull of a giant crow mixed in with various bits of mushed and mashed organs, entrails and local roots..."
  • "...connected to the bark of an old red giant tree."
  • "The perfect evil wizard starter kit..."

Fancy lounge[]

Arbo Lounge

The fancy lounge.

Luxurious chaise longue[]

A fancy longue with some opened books resting upon it.

  • "Varnished wood... satin pillows..."
  • "A bunch of leather bound books..."
  • "I wonder which noble had their personal garden here."

Chaise longue[]

A rougher longue with some gardening equipment resting beside it.

  • "Gloves, a pitchfork... Maybe a courtier tried their hand at gardening?"
  • "No, you wouldn't find one that would sit on such a shabby piece of furniture."
  • "Or wear this outfit."
  • "It seems the gardener had his entrances into the palace too."

Once the Beheaded says, "Or wear this outfit." the Gardener's Outfit IconGardener's Outfit blueprint will drop.

Yeeter room[]

Arboretum Body Room

Pile of dead Yeeters

A room filled with the bodies of Yeeters and a human corpse.

  • "By the King's command, you are to burn the entire Arboretum down until nothing is left but cinders."
  • "And ignore the gardener's protestations... he is no longer under the Crown's protection."

Research room[]

Arbo Research Desk

Research room

A research room with a desk, cabinet and plants. A letter and order from the king can be found.


  • "I'm alive again... but I can feel the madness lurking in the shadows. And I don't think these medical plants will help me for long."

King's order[]

  • "Yet another order to burn down the Arboretum"

Large water pipe[]

A large room can be found containing a giant water pipe snaking through it.

Scribbled note[]

At the opposite end of the entrance there is a spout attached to the pipe with a warning sign hanging from it.

  • ...
  • But where does it go?


  • It appears that there was some form of experimentation going on within the arboretum that involved using people and animals as a base for the growth of some of the various plants and fungi found within the large glass canisters. Various skeletons can be seen within the soil of certain plants. In the case of the large tree, whole organs and people were attached to it for some sick, unknown purpose.