Imaginarium Theater Full Guide (October) | Genshin

Today, we bring you the guide for Version 6.0's Imaginarium Theater. This version introduces the higher - difficulty "Lunar Mode", needing 28-32 characters with 12 combat acts. Compared to "Excellence Mode", it requires 6 more characters but offers an extra 200 Primogems as regular rewards, plus a 300 Primogems initial reward upon completion.

The Imaginarium Theater is among Genshin Impact's most thrilling seasonal challenges, combining unique mechanics, rotating elemental restrictions, and a well - selected cast. Success relies on understanding seasonal rules, using elemental reactions well, and making smart team - building choices with limited rosters. In this guide, we'll cover essential strategies, boss mechanics, and character recommendations to help you master each act, whether for smooth clears or high scores, maximizing your roster's potential.

What to know up front

Elements

Electro

Hydro

Geo

The only elements available this season are Electro, Hydro, and Geo. That means your entire roster and reaction options must come from these three.

 

Opening Characters

Yelan	Aino	Varesa
Lansan	Arataki Itto	Gorou

Any Opening Character chosen this season receives a +20% HP, ATK, and DEF bonus. This buff applies inside the Theater and beyond, so slot in whichever Opening Character you’ve built — it’s essentially free stats that scale with your team.

 

Characters Recommendation

Electro
Ineffa	Flins	Clorinde	Yae Miko
Fischl	Raiden Shogun	Ororon
Hydro
Neuvillette	Furina	Mualani	Xingqiu
Sangonomiya Kokoi	Sigewinne	Kamisato Ayato
Geo
Zhongli	Navia	Xilonen	Chiori
Kachina	Yunjin	Albedo

Note that these characters can only be used if you own them yourself. However, if you want to use someone else's Special Guest, you can always do so through the Supporting Cast system.

 

Special Invitation

Lauma

Baizhu

Charlotte

Ifa

 

Act highlights, Boss tactics & Character recommendation

Act 3

Veteran Arithmetic Enhancer Mek

Initially, it has Ousia Power, which provides a 20GU Geo Armor that raises all its resistances by 200%. Once this armor is destroyed, a single Pneuma attack can bring about annihilation, ending the Ousia Power and immobilizing it for 5 seconds – and this annihilation can't happen when the armor is still there. While under the effect of Ousia Power, it's immune to Freeze and Petrification; even after Pneuma annihilation, it still maintains 90% Freeze resistance. Additionally, it regains Ousia Power 12 seconds after being annihilated and gets its armor back 15 seconds after the armor is destroyed.

 

Character Recommendation

Navia

Fischl

Xilonen

Chiori

Tip:In the boss battle of Act 3, you'll come up against the Arithmetic Enhancer Mek. This means you need to bring characters that can help break through its shield. For example, Geo characters like Navia work well, and blunt attacks such as plunging attacks are also good options. If you choose to go with the plunging attack approach, it's recommended to use Claymore characters.

Geo DPS characters perform the best in this Act. But generally speaking, you can use any DPS characters as long as they can efficiently break the Mek's shield.

 

Act 6

Algorithm of Semi-Intransient Matrix of Overseer Network

This ancient cluster of machinery comes from the desert and has characteristics that modern civilizations can't understand. In combat, the Algorithm of Semi-Transient Matrix of Overseer Network will launch its components, and at the same time, its core will enter an "invisible" state, which hides the core and boosts its resistance (RES). You can use Catalyze reactions to attack this core, or when the launched components have been destroyed and need to recover, use Electro attacks on the core. This can cancel the invisibility and make the core immobilized because of overclocking. If you fail to cancel the core's invisibility for a long time, the Algorithm of Semi-Transient Matrix of Overseer Network will start to show its power by using a powerful overclocked attack...

 

Character Recommendation

Flins

Ineffa

Aino

Beidou

Tip: Act 4 is Monolith Defense. Since you can use Electro and Hydro characters, bring one with the ability to stall, such as Ororon. AoE characters like Neuvillette or teams that utilize Electro-Charged reactions are also great choices.

 

 

Act 8

"Statue of Marble and Brass"

Tip: It has a 32U Geo Armor. This armor is 4 times as strong as that of Geo Slimes and 1.6 times as strong as the armor of the Local Legend Field Generator. The armor will regenerate 10 seconds after being destroyed. Every 30 seconds, a Musical Note will show up. If you hit the Note 6 times, it will be destroyed, and 20% of the Geo Armor will be consumed.

 

Character Recommendation

Varesa

Iansan

Zhongli

Kokomi

Tip: For Act 8's Legatus Golem, your team must have a Geo character to break its shield. Besides, blunt attacks such as plunging attacks and Claymore strikes can also help take down the shields.

You should bring characters like Navia, Noelle, and Zhongli because they can break the shield without much difficulty.

 

Act 10

Goldflame Qucusaur Tyrant

Tip: It switches between the Golden Flame state and the normal state, with each state lasting 45 seconds respectively; for the Abyss version, the durations are 90 seconds and 30 seconds, and it enters the Golden Flame state right away in battle. During the Golden Flame state, it gains a 24GU Pyro Shield and will fly extremely high into the air and swoop down repeatedly; when this shield is broken, it exits the Golden Flame state. Moreover, every time before it takes off, it summons a 2GU Pyro Feather (the Abyss version summons 2 Feathers), and if all these Feathers are destroyed before the swoop, the massive damage dealt by the swoop will be reduced (v3).

 

Character Recommendation

Neuvillette

Ineffa

Furina

Fischl

Tip: The final boss in Act 10 is the Goldflame Qucusaur Tyrant. To quickly deplete its feathers, Hydro Characters are needed, though Electro Characters can also be used, they aren't as efficient. Notably, Furina is excellent against this boss because her Salon Members can pursue the Qucusaur even when it's in the air.

 

Lunar Mode: Arcana Challenges

Arcana Challenge 1

Stone Enchanter	Desert Clearwater	Scorching Loremaster	Daythunder
Keep battling until the countdown finishes. To successfully complete the challenge, you need to end the stage with at least one character still alive. Every opponent you defeat will reduce the remaining countdown time. When the challenge starts, Electro Bursts will go off at regular intervals, causing Electro damage to your active character.

Tip： In this challenge, waves of Eremites will keep appearing. Especially, Electro-Charged or Lunar-Charged is really great for this because they have Area of Effect (AoE) abilities.

But, you should know that you have to defeat 17 enemies within 5 minutes. However, the timer will be reduced by 15 seconds every time you defeat an enemy.

 

Arcana Challenge 2

Jadeplume Terroshroom

It's an evolved fungus. When attacked by Electro or hit by Catalyze reactions, it gains Activation. But if hit by Pyro attacks, it loses Activation progress. Once it gets enough Activation, it enters an Activated state. In this state, the Jadeplume Terrorshroom unleashes more terrifying attacks until it tires out. When not Activated, using Pyro can put the Jadeplume Terrorshroom into a Burning state, making it Scorched. Then, it spreads spores around to create other fungi, trying to get rid of this Burning status.

Tip：Electro-Charged or Lunar-Charged is the most effective way to quickly take down the Jadeplume Terrorshroom. Yet, you should be careful with your Hydro characters as you'll need to save them for Act 10. If you're holding back on using Hydro units, having good Electro characters should be enough because you'll need them to activate and wear out the Jadeplume to deal more damage. Focus on inflicting Electro DMG on the Jadeplume to make it enter its Activated state. In this state, it will start to rampage but soon tire itself out, which reduces its resistances. Raiden, Clorinde, and Flins are the top choices for this challenge.

 

Conclusion

The Imaginarium Theater serves as a demanding test of strategy, reaction management, and character preparation. Each act requires careful planning, from reading enemy mechanics to choosing the most effective elemental synergies under seasonal restrictions. By refining rotations and maximizing the value of Blessings, players can steadily progress and overcome even the most punishing encounters.

Strengthening the account also plays an important role in long-term success, and topping up Genesis Crystals through LDShop offers a reliable and efficient way to unlock new characters, weapons, and resources. With the proper preparation and support, every challenge within the Theater can be approached with confidence and consistency.