A mysterious blight is spreading through the Candy Kingdom, turning candy people into mindless husks. The heroes must investigate the source, rally allies, and protect Princess Bubblegum's realm before it crumbles.

The Ice King's crown is fracturing, releasing ancient magic across the land. The heroes must delve into Simon Petrikov's tragic past, brave the Ice Kingdom, and decide whether the crown can be saved — or must be destroyed.

The barrier between Ooo and the Nightosphere is weakening. Demonic incursions threaten the land while an ancient evil manipulates events from the shadows. The heroes must venture into the Nightosphere itself to seal the breach.

The true enemy reveals itself. The Lich — an ancient undead horror older than Ooo itself — has been orchestrating everything. The heroes must gather the legendary Gems of Power, confront the Lich in his prison dimension, and end his threat once and for all.

A vast post-apocalyptic fantasy continent reshaped by ancient magic and mutagenic fallout. What was once Earth is now a land of candy kingdoms, ice mountains, fire realms, and talking animals. Magic is everywhere and the rules of reality are more like suggestions. The land is dotted with dungeons, ruins from the old world, and kingdoms ruled by eccentric royalty.

A cozy cave home decorated with band posters, old photos, and centuries of collected mementos. Marceline's bass guitar-axe hangs on the wall. The cave has a hidden basement with relics from her past — including items from Simon Petrikov and the old world. A portal to the Nightosphere can be opened here.

Ancient tunnels beneath the Candy Kingdom made of crystallized sugar and hardened caramel. Predates Princess Bubblegum's reign. Home to forgotten candy experiments, ooze creatures that feed on sugar, and the necrotic artifact causing the blight. Walls glow faintly pink. Deeper chambers are corrupted — black mold spreads across the candy surfaces.

A magical dungeon that exists inside the Ice King's fractured mind. Each room represents a memory from Simon Petrikov's life — his antiquarian shop, the day he found the crown, the Mushroom War, losing Betty, and his descent into madness. The rooms shift and change as Simon's psyche destabilizes. Combat encounters manifest from his fears and regrets.

A dungeon built around the portal between Ooo and the Nightosphere. Reality is unstable here — rooms rotate, gravity shifts between walls, and demonic energy warps perception. Traps are both mechanical and magical. Demons guard the gate mechanism, which can be opened or sealed depending on the heroes' choices.

The Lich's prison dimension — a vast dungeon constructed from bone, shadow, and solidified death magic. The air itself drains life force. Walls pulse with necrotic energy. Undead generals patrol the halls. The deeper you go, the more reality breaks down — time slows, colors fade, and hope literally dims. At its center, the Lich waits in a chamber of absolute darkness.

A scorching desert on the edge of Ooo. Buried beneath the sand is a temple from the old world containing one of the Gems of Power. Sand worms, heat mirages, and ancient traps protect the temple. The gem is guarded by a construct that has been waiting for millennia.

An infinite magical train that travels through a pocket dimension. Each train car is a self-contained dungeon room with monsters and treasure. Monsters get progressively harder as you move toward the engine. The train never stops — you can only leave by jumping off, and the landscape outside is a void. Perfect for a combat-focused side session.

Princess Bubblegum's people are turning feral. Investigate the source of the blight in the Candy Catacombs, find the necrotic artifact causing it, and either destroy or contain it. The artifact may be connected to something much older and darker than anyone suspects.

The Ice King's crown is fracturing, threatening to destroy both Simon's mind and the Ice Kingdom. Enter Simon's Memory Dungeon, defeat the crown's psychic manifestation, and decide: reforge the crown (saving Simon but risking future corruption) or destroy it (freeing Simon but unleashing wild ice magic).

Something is tearing holes between Ooo and the Nightosphere. Travel to the Nightosphere Gate dungeon, fight through demonic defenders, and either seal the breach from Ooo's side or cross into the Nightosphere to fix it at the source. Marceline and Hunson Abadeer are involved — and neither is easy to work with.

Four legendary gems are needed to defeat the Lich. One is in the Fire Kingdom (guarded by Flame Princess's trial), one drifts through Lumpy Space (LSP knows where), one is buried in the Desert of Doom (in an old-world temple), and one was hidden by Prismo himself.

The ancient undead horror behind everything must be stopped. Brave the Citadel of the Lich, defeat his generals, and confront him in a multi-phase battle using the Gems of Power. The fate of all life in Ooo hangs in the balance.

Peppermint Butler offers forbidden knowledge about the Lich and the Nightosphere — but his price is a favor to be named later. Accepting his help provides crucial intel but creates a debt to a being with terrifying connections. What will he ask for when the time comes?

BMO asks the heroes to find their lost friend — a sentient calculator named ALLMO who disappeared into a dungeon years ago. A heartwarming side quest that leads to a small dungeon with construct enemies. ALLMO is found powered down and can be restored, giving BMO a companion and the party a quirky ally.

A mysterious train appears in the Grasslands. Each car is a dungeon room with monsters and loot. How far can the heroes get before jumping off? A pure combat challenge with escalating difficulty and increasingly absurd treasure.

Candy Zombie Outbreak

Blighted candy people shamble through the Candy Catacombs, their sugar bodies twisted by necrotic energy. They moan in garbled candy-speak and explode into sticky goo when destroyed. A larger candy abomination leads the horde — a fusion of multiple candy people into one oozing mass.

Corrupted Grasslands

The blight has spread to the Grasslands, turning vegetation hostile. Grass Ogres lumber through fields of razor-sharp blighted grass, while a massive Shambling Mound of corrupted plant matter blocks the path. The land itself fights back.

Ice Kingdom Gauntlet

The fractured crown has driven ice creatures into a frenzy. Remorhaz tunnel through the frozen ground while ice-touched wraiths howl through blizzard winds. The heroes must fight their way to the Ice King's castle through a frozen battlefield.

The Crown's Psychic Manifestation

Inside Simon's mind, the Ice Crown manifests as a towering spectral entity — a Mind Flayer-like horror made of frozen memories and madness. It tries to dominate the heroes and trap them in Simon's worst memories. Defeating it weakens the crown enough to make a choice about its fate.

Nightosphere Portal Breach

Demons pour through a rip between dimensions. Fiends of increasing power emerge while the portal grows. The heroes must fight off waves while Marceline works to stabilize the breach. If the portal isn't contained, a pit fiend steps through for a climactic showdown.

Hunson Abadeer's Court

In the Nightosphere, Hunson Abadeer demands the heroes prove their worth before he'll cooperate. His "test" is survival against his personal guard — fiends in business suits wielding soul-draining weapons. Hunson watches from his executive chair, eating souls from a candy dish.

Fire Kingdom Trial

Flame Princess agrees to give the heroes her Gem of Power — if they can survive the Fire Kingdom's trial chamber. A gauntlet of fire-themed hazards and elemental guardians in an arena of flowing lava. The Treant here is petrified wood brought to burning life.

The Lich's Generals

Deep in the Citadel, the Lich's two most powerful servants bar the way: a Death Knight who was once a hero of old Ooo, and a Mummy Lord who served the Lich before the Mushroom War. They fight in tandem in a chamber of bone pillars.

The Lich — Final Battle

The Lich manifests in his full terrible glory. Phase 1: a spellcasting horror that dominates minds and decays flesh with a word. Phase 2: he absorbs necrotic energy from the citadel and becomes a hulking undead titan. Phase 3: the heroes must use the Gems of Power to seal him while he desperately tries to complete his escape. The dungeon collapses around them.

Dungeon Train Car: The Mimic Carriage

A train car that looks like an ordinary passenger carriage — but every piece of furniture is a Mimic. The seats bite, the luggage rack grabs, and the chandelier drops. A fun, chaotic fight in a confined space.

Dungeon Train Car: The Beholder's Parlor

A luxurious parlor car with velvet curtains and crystal chandeliers. At the far end, a Beholder floats behind a card table, playing solitaire. It challenges the heroes to a "game" — combat with escalating eye ray attacks between rounds of twisted trivia.