Imaginarium Theater/Seasons/2025-12-01

Season 18 of Imaginarium Theater was during Version "Luna II" and lasted from December 01, 2025 to January 01, 2026.

Season Details

Opening Characters

Klee

Bennett

Citlali

Diona

Chasca

Sucrose

Fantastical Blessing

After the above characters join your party, Max HP, ATK, and DEF are increased by 20%.

Alternate Cast Elements

Pyro
Cryo
Anemo

Special Guest Stars

Mualani

Albedo

Mona

Fischl

Primary Antagonists

Lv. 90 Primo Geovishap

Lv. 92 Aeonblight Drake

Lv. 95 Solitary Suanni

Lv. 100 Gluttonous Yumkasaur Mountain King

Battles

Act 1

Battle: Normal

Stage Effects:
- Treacherous Thunder: A period of time after the challenge begins, thunder will descend and strike your characters.

Opposing Lineup 1
Enemy Level	Easy Mode: 75 Normal Mode: 80 Hard/Visionary Mode: 85
Performance Goals	Defeat all opponents "Star Challenge" Defeat all opponents within 65s
Advantages	Ousia-aligned attacks have an advantage
Enemies	Wave 1: 5 Recon Log Mek - Pneuma Wave 2: 1 Construction Specialist Mek - Pneuma 3 Geological Survey Mek - Pneuma
Opposing Lineup 2
Enemy Level	Easy Mode: 75 Normal Mode: 80 Hard/Visionary Mode: 85
Performance Goals	Defeat all opponents "Star Challenge" Defeat all opponents within 65s
Enemies	1 Thundering Wayob Manifestation

Battle: Elite Assault

Stage Effects:
- Enemy En Garde: Opponents within a certain radius of opponents affected by this buff have their ATK increased by 50% and their All Elemental and Physical RES increased by 30%.
- Treacherous Thunder: A period of time after the challenge begins, thunder will descend and strike your characters.

Opposing Lineup 1
Enemy Level	Easy Mode: 75 Normal Mode: 80 Hard/Visionary Mode: 85
Performance Goals	Defeat all opponents "Star Challenge" Defeat all opponents within 85s
Advantages	Focus fire on a single enemy Pneuma-aligned attacks have an advantage
Enemies	Wave 1: 1 Ruin Grader 3 Ruin Destroyer Wave 2: 1 Construction Specialist Mek - Ousia 2 Assault Specialist Mek - Ousia

Act 2

Battle: Normal

Stage Effects:
- Treacherous Thunder: A period of time after the challenge begins, thunder will descend and strike your characters.

Opposing Lineup 1
Enemy Level	Easy Mode: 75 Normal Mode: 80 Hard/Visionary Mode: 85
Performance Goals	Defeat all opponents "Star Challenge" Defeat all opponents within 65s
Advantages	Ousia-aligned attacks have an advantage
Enemies	Wave 1: 2 Nimble Harvester Mek - Pneuma 1 Geological Survey Mek - Pneuma 2 Recon Log Mek - Pneuma Wave 2: 1 Construction Specialist Mek - Pneuma
Opposing Lineup 2
Enemy Level	Easy Mode: 75 Normal Mode: 80 Hard/Visionary Mode: 85
Performance Goals	Defeat all opponents "Star Challenge" Defeat all opponents within 65s
Enemies	Wave 1: 1 Close Combat Storm Landcruiser 1 Close Combat Scout Landcruiser Wave 2: 1 Cutting Edge All-Purpose Storm Landcruiser 1 Oprichniki Thunderblitz Gvardiya

Battle: Elite Assault

Stage Effects:
- Treacherous Thunder: A period of time after the challenge begins, thunder will descend and strike your characters.
- Horror Effects: Some opponents will have Energy Crystal Clusters attached when they appear. Crystal Clusters will periodically attack characters, dealing True DMG. After each time Energy Crystal Clusters attack, their DMG will increase, max 6 stacks. After an opponent with an Energy Crystal Cluster is defeated, the Cluster will drift away for a time, after which the Cluster will attach to the nearest opponent with the highest percentage of their max HP and its DMG increase stacks will reset.

Opposing Lineup 1
Enemy Level	Easy Mode: 75 Normal Mode: 80 Hard/Visionary Mode: 85
Performance Goals	Defeat all opponents "Star Challenge" Defeat all opponents within 85s
Advantages	Pyro characters have an advantage
Enemies	Wave 1: 1 Hydro Hilichurl Rogue 1 Anemo Hilichurl Rogue Wave 2: 2 Frostarm Lawachurl

Act 3

A Primo Geovishap awoken from a centuries-long slumber that can absorb different kinds of elemental power to unleash a Primordial Shower infused with Hydro, Pyro, Cryo, or Electro. If this attack hits a character protected by a shield, the Primo Geovishap will take some DMG in return. If the shield's elemental type is Geo or it matches that of the Primordial Shower, the amount of reflected DMG will be increased...

Primo Geovishap

Battle: Climactic Showdown

Opposing Lineup 1
Enemy Level	Easy Mode: 80 Normal Mode: 85 Hard/Visionary Mode: 90
Performance Goals	Defeat the Villain(s) within the time limit (105s) "Star Challenge" Defeat all opponents within 70s
Advantages	Shields have an advantage
Enemies	1 Primo Geovishap (Electro)

Arcana Challenge I

Keep fighting until the countdown ends. End the stage with at least one character left standing to successfully complete the challenge. Each opponent you defeat will take time off the countdown.
Once the challenge begins, Cryo Bursts will periodically be set off, dealing Cryo DMG to your active character.

Stage Effects:
- Cryo Discharge: Once the challenge begins, Cryo Bursts will periodically be set off, dealing Cryo DMG to your active character(s)

Opposing Lineup 1
Enemy Level	100
Performance Goals	Arcana Challenge Keep fighting until the countdown ends (360s) "Star Challenge" Defeat 9 opponents
Advantages	Bows have an advantage Shields have an advantage
Enemies	- Ruin Grader - Ruin Guard - Ruin Drake: Skywatch - Ruin Drake: Earthguard

Act 4

Battle: Defense Sequence

Opposing Lineup 1
Enemy Level	Normal Mode: 85 Hard/Visionary Mode: 90
Performance Goals	Prevent the Ley Line Monolith's destruction. Defeat opponents to deplete the timer (240s) "Star Challenge" Ley Line Monolith's remaining HP not less than 35%
Advantages	Enemies Are Easily Grouped
Enemies	- Treasure Hoarders: Crusher - Treasure Hoarders: Marksman - Treasure Hoarders: Gravedigger - Treasure Hoarders: Pugilist - Treasure Hoarders: Seaman - Treasure Hoarders: Handyman - Fatui Pyro Agent(periodically inflicts Smoldering Flames) - Fatui Pyro Agent(the enemy has the Tracking Fire Ball aura attached)
Opposing Lineup 2
Enemy Level	Normal Mode: 85 Hard/Visionary Mode: 90
Performance Goals	Prevent the Ley Line Monolith's destruction. Defeat opponents to deplete the timer (240s) "Star Challenge" Ley Line Monolith's remaining HP not less than 35%
Enemies	- Blazing Axe Mitachurl - Crackling Axe Mitachurl

Battle: High-Pressure Defense

Opposing Lineup 1
Enemy Level	Normal Mode: 85 Hard/Visionary Mode: 90
Performance Goals	Prevent the Ley Line Monolith's destruction. Defeat opponents to deplete the timer (230s) "Star Challenge" Ley Line Monolith's remaining HP not less than 35%
Advantages	Enemies Are Easily Grouped Powerful foes present
Enemies	- Cutting Edge All-Purpose Storm Landcruiser - Oprichniki Grenadier - Oprichniki Line Trooper - Oprichniki Vanguard - Oprichniki Medic - Oprichniki Bombardier

Act 5

Battle: Normal

Opposing Lineup 1
Enemy Level	Normal Mode: 85 Hard/Visionary Mode: 90
Performance Goals	Defeat as many opponents as possible (at least 20) within the time limit (120s) "Star Challenge" Defeat 24 opponents
Advantages	Cryo characters have an advantage
Enemies	- Hydro Mimic Boar - Hydro Mimic Crane - Hydro Mimic Squirrel - Hydro Mimic Mallard - Hydro Mimic Finch - Hydro Mimic Crab - Hydro Mimic Frog
Opposing Lineup 2
Enemy Level	Normal Mode: 85 Hard/Visionary Mode: 90
Performance Goals	Defeat as many opponents as possible (at least 15) within the time limit (120s) "Star Challenge" Defeat 18 opponents
Enemies	- Nobushi: Jintouban - Nobushi: Hitsukeban - Nobushi: Kikouban

Battle: Elite Assault

Stage Effects:
- Last Stand: Opponents under this effect gain 25% ATK. For each opponent defeated, the aforementioned ATK bonus is increased by an additional 25%. Max 3 stacks.

Opposing Lineup 1
Enemy Level	Normal Mode: 85 Hard/Visionary Mode: 90
Performance Goals	Defeat as many opponents as possible (at least 34) within the time limit (120s) "Star Challenge" Defeat 40 opponents
Advantages	Enemies Are Easily Grouped
Enemies	- Winged Dendroshroom - Grounded Geoshroom - Stretchy Geo Fungus - Floating Dendro Fungus - Whirling Pyro Fungus - Stretchy Anemo Fungus - Floating Hydro Fungus - Whirling Electro Fungus

Act 6

A ruin machine that can absorb energy and hurl it back as an attack. This machine has even greater abilities than the Ruin Drake, being able to attack from the air and on the ground. The Aeonblight Drake can periodically release a dangerous torrent of energy and increase its own Elemental RES against the previous main type of Elemental DMG it has suffered. Under various circumstances, the cores all over its body will be exposed. Take such opportunities to attack those cores, and you may be able to immobilize this creature and remove its Elemental RES boost. Whenever this creature recovers from paralysis, it will switch between aerial and ground-attack forms.

Aeonblight Drake

Battle: Climactic Showdown

Opposing Lineup 1
Enemy Level	Normal Mode: 90 Hard/Visionary Mode: 92
Performance Goals	Defeat the Villain(s) within the time limit (120s) "Star Challenge" Defeat all opponents within 80s
Advantages	Bows have an advantage
Enemies	1 Aeonblight Drake

Arcana Challenge II

Defeat all opponents within the time limit.

Opposing Lineup 1
Enemy Level	100
Performance Goals	Defeat powerful opponent(s) within the time limit (105s) "Star Challenge" Defeat all opponents within 70s
Advantages	Shields have an advantage
Enemies	Wave 1: 1 Consecrated Scorpion Wave 2: 1 Consecrated Fanged Beast

Act 7

Battle: Normal

Stage Effects:
- Survival Pressure: A period of time after the challenge begins, all party members will continuously lose small amounts of HP.

Opposing Lineup 1
Enemy Level	92
Performance Goals	Defeat all opponents "Star Challenge" Defeat all opponents within 65s
Advantages	Ousia-aligned attacks have an advantage
Enemies	Wave 1: 1 Annihilation Specialist Mek - Pneuma Wave 2: 1 Construction Specialist Mek - Pneuma 1 Suppression Specialist Mek - Pneuma
Opposing Lineup 2
Enemy Level	92
Performance Goals	Defeat all opponents "Star Challenge" Defeat all opponents within 65s
Advantages	Being in the Nightsoul's Blessing state gives an advantage
Enemies	Wave 1: 3 Xuanwen Beast Wave 2: 1 Secret Source Automaton: Hunter-Seeker

Battle: Elite Assault

Stage Effects:
- Survival Pressure: A period of time after the challenge begins, all party members will continuously lose small amounts of HP.
- Enemy Stunt Double: The HP Percentage of all opponents affected by this will change at intervals: After changing, all their HP% values will be the same as the HP% of the affected opponent with the highest current HP%.

Opposing Lineup 1
Enemy Level	92
Performance Goals	Defeat all opponents "Star Challenge" Defeat all opponents within 80s
Enemies	Wave 1: 1 Qucusaurus Warrior: Blazing Sky 1 Qucusaurus Warrior: Heartstar Hammer Wave 2: 1 Iktomisaurus Warrior: Icy Tidebearer 1 Iktomisaurus Warrior: Cryocrystal Cannon Wave 3: 1 Tepetlisaurus Warrior: Shard Striker 1 Tepetlisaurus Warrior: Rockbreaker Blade

Act 8

A Yumkasaurus that has experienced numerous impressive battles. It is not some abnormal mutant but has grown into its current shape due to its gluttony. It will collect Flamegranates during combat and spit them out as bombs. However, if you can use Pyro to ignite the Flamegranates before the Gluttonous Yumkasaur Mountain King can swallow them, who knows what might happen...

Gluttonous Yumkasaur Mountain King

An illuminated beast that dwells deep within the mountains that can use Hydro and Anemo simultaneously in battle. Render it Frozen while it is gathering Hydro-aligned adeptal energy, before using Shatter, Melt, or other Elemental Reactions to break the ice and cause it to enter an immobile state. When it is gathering Anemo-aligned adeptal energy, use attacks from Elements that can react with Anemo to destroy the Spiritwind Pearls summoned during the process to achieve the same advantage.

Solitary Suanni

Battle: Climactic Showdown

Hard Mode Challenge
Enemy Level	95
Performance Goals	Defeat the Villain(s) within the time limit (110s) "Star Challenge" Defeat all opponents within 75s
Advantages	Pyro characters have an advantage
Enemies	1 Gluttonous Yumkasaur Mountain King
Visionary Mode Challenge
Enemy Level	95
Performance Goals	Defeat the Villain(s) within the time limit (110s) "Star Challenge" Defeat all opponents within 75s
Advantages	Cryo characters have an advantage Shatter reactions have an advantage
Enemies	1 Solitary Suanni

Act 9

Battle: Normal

Opposing Lineup 1
Enemy Level	95
Performance Goals	Defeat a specific number of Bounties (3) within the time limit (100s) "Star Challenge" Complete the main challenge objective within 65s
Advantages	Shields have an advantage
Enemies	- Tainted Water-Spouting Phantasm - Tainted Water-Splitting Phantasm - Hydro Mimic Boar - Hydro Mimic Crane - Hydro Mimic Mallard - Hydro Mimic Raptor
Opposing Lineup 2
Enemy Level	95
Performance Goals	Defeat a specific number of Bounties (2) within the time limit (85s) "Star Challenge" Complete the main challenge objective within 55s
Advantages	Pyro characters have an advantage
Enemies	- Frostarm Lawachurl - Hilichurl Grenadier - Hilichurl Fighter - Electro Hilichurl Grenadier - Electro Hilichurl Shooter - Hilichurl Berserker - Pyro Hilichurl Shooter

Battle: Elite Assault

Stage Effects:
- Thrilling Duel: When the active character is within the Duel Zone of an elite opponent, that character's DMG will be increased by 40%. When they are outside a Duel Zone, they will take DMG every 2s.

Opposing Lineup 1
Enemy Level	95
Performance Goals	Defeat a specific number of Bounties (3) within the time limit (100s) "Star Challenge" Complete the main challenge objective within 65s
Advantages	Melee has an advantage
Enemies	- Ruin Grader - Ruin Guard - Ruin Scout - Ruin Destroyer - Ruin Defender - Ruin Cruiser

Act 10

A Yumkasaurus that has experienced numerous impressive battles. It is not some abnormal mutant but has grown into its current shape due to its gluttony. It will collect Flamegranates during combat and spit them out as bombs. However, if you can use Pyro to ignite the Flamegranates before the Gluttonous Yumkasaur Mountain King can swallow them, who knows what might happen...

Gluttonous Yumkasaur Mountain King

Battle: Climactic Showdown

Opposing Lineup 1
Enemy Level	100
Performance Goals	Defeat the Villain(s) within the time limit (110s) "Star Challenge" Defeat all opponents within 75s
Advantages	Pyro characters have an advantage
Enemies	1 Gluttonous Yumkasaur Mountain King