Imaginarium Theater Full Guide (September) | Genshin

The Imaginarium Theater is one of Genshin Impact’s most exciting seasonal challenges, blending unique mechanics, rotating elemental restrictions, and a carefully curated cast of characters. Success here isn’t just about raw damage — it’s about understanding the seasonal rules, leveraging elemental reactions effectively, and making smart team-building decisions around limited rosters.

In this guide, we’ll walk through the essential strategies, boss mechanics, and character recommendations you need to master every act of this season’s Theater. Whether you’re aiming for smoother clears or chasing high scores, this breakdown will help you plan ahead and get the most out of your roster.

 

What to know up front

Elements

Pyro

Hydro

Dendro

The only elements available this season are Pyro, Hydro, and Dendro. That means your entire roster and reaction options must come from these three. Plan to center your strategies on Vaporize (Pyro + Hydro) and Burning (Pyro + Dendro), as both perform exceptionally under these restrictions.

 

Opening Characters

Hu Tao	Thoma	Xingqiu
Nilou	Collei	Baizhu

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.

 

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Special Invitation

Chasca

Citlali

Iansan

Ineffa

A select lineup of Special Invitation gains double progression when raising Blessing Level. That means each fight pushes your chosen blessing’s level twice as fast, supercharging reaction damage. If you own these guests, prioritize them; if not, check the Supporting Cast and borrow one. They can make the difference in scaling damage for tougher acts.

 

Brilliant Blessing pick

For this run the recommended Brilliant Blessings are the Vaporize (Hydro+Pyro) or Burning (Pyro+Dendro) trees — both scale better here because the season limits to Pyro/Hydro/Dendro. Max whichever reaction suits your roster before you step into the boss-heavy acts.

 

Act highlights, Boss tactics & Character recommendation

Act 3

Maguu Kenki: Lone Gale	Maguu Kenki: Galloping Frost	Maguu Kenki: Mask of Terror
Tip: The rightmost Maguu Kenki: Galloping Frost will dash large distances at round start; bait it into using the Dual Sword Burst (ice AoE) by hugging it until it commits, then kite to the other two to let your AoE cleave them when they cluster.

 

Character Recommendation

Choice 1 - Vaporize
Hu Tao		Xingqiu
Choice 2 - Bloom
Nilou			Baizhu
Alhaitham	Furina			Neuvillette

 

Act 6

Tenebrous Papilla: Type III

During Void Fantasia, its frequency shield Void Barrier will appear for 15s, blocking all DMG. This requires 53 Elemental attacks (Domain Version 72) to destroy. Nightsoul-attribute attacks are considered as 3 attacks. Domain Version all RES increased to 70%. Destroy the Void Barrier while it exists and all RES will be reduced for some time. During Void Fantasia, will constantly attack, consuming the character's HP upon hit, ignoring shields. If the Void Barrier is not destroyed in time, will additionally consume HP equal to 60% Max HP + 3000, and deal massive Physical DMG to the entire arena.

Two safe approaches

• High-application teams: Use multi-hit or Nightsoul attacks to quickly destroy the Void Barrier before it triggers massive HP drain.
• Burning / high-tick Pyro loops: Apply sustained Pyro damage to stack counted hits while keeping HP safe.

 

Character Recommendation

Citlali	Mavuika	Kinich
Chasca	Traveler(Pyro)	Yaoyao

Citlali, Mavuika, and Kinich produce frequent multi-hit or sustained elemental application that helps drain multi-hit shields. Chasca’s Nightsoul bursts contribute extra counted hits. Pyro Traveler provides off-field Pyro with a moderate tick rate. Yaoyao supplies steady Dendro application plus team healing for survival.

 

Act 8

Potapo's Solidarity

Will manifest during combat as a "Protection Spirit" and a "Hostile Spirit." Of the two types, the Protection Spirit will create a spirit:connection with the character, and when each member of the party receives healing, Hp will be recovered for the Protection Spirit. When the Protection Spirit's HP is fully restored, it will use the coordinated attack "Pierce: Binding of Dawn and Dusk's Breaking" to attack the Hostile Spirit. At this time, the more Hp is restored to the Protection Spirit, the greater the damage that will be dealt, until finally "Pierce: Binding of Dawn and Dusk's Breaking" can be transformed into the more powerful “Decisive: Binding of Dawn and Dusk's Breaking”.

Tip: Bring 2-3 AoE supports to keep the entire party’s HP high. Consistent team-wide healing maximizes the Protection Spirit’s coordinated attacks and overall damage potential.

 

Character Recommendation

Baizhu		Barbara
Kokomi	Yaoyao		Neuvillette

 

Act 10

Lava Dragon Statue

Every Pyro hit +1% charge, Pyro application +3.4% charge per 1U. When hit by Cryo or Hydro, loses 22% charge. When fully charged, evolves into Molten Dragon: Permanent Pyro aura, Pyro RES 150%, other RES 45%。 When fully charged again, becomes Weakened: All RES 10% for 17s, then returns to Geohuman form.

Tips

• This boss revolves around Pyro charging: it converts between forms as Pyro application rises, gaining enormous Pyro RES while charging, and can be de-charged by Cryo or Hydro hits. At full charge it becomes Molten Dragon (huge Pyro aura and RES), and when you charge it again it drops into a vulnerable weakened window (significantly reduced RES for ~17s) — that’s your DPS window.
• Because of the charge-/decharge rhythm, you need high-frequency Pyro application to control the form changes AND a plan to detonate during the limited weakened phase. If your Pyro carry can only burst once per long cooldown, time it to hit the weakened window (Phase 3).

 

Character Recommendation

Mavuika	Neuvillette	Chasca
Bennett	Nahida	Emilie
Kinich	Xiangling	Mualani

On Lava Dragon Statue, on-field Pyro drivers such as Mavuika, Chasca, and Xiangling rapidly build the Pyro gauge with frequent multi-hit or off-field Pyro application. Hydro units like Neuvillette and Mualani enable elemental reactions to make full use of every weakened window, while Bennett provides healing and a potent Pyro ATK buff for burst phases.

 

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.