Quick Answer: Imaginarium Theater September 2025 (Season 15) features Pyro, Hydro, and Dendro elements with Opening Characters including Hu Tao and Xingqiu. Players can earn 800 monthly Primogems plus 1500 debut rewards, with strategic team compositions focusing on Vaporize and Burning reactions for optimal boss clearing.
Imaginarium Theater September 2025: What You Need to Know
The Basics (If You're New Here)
So you've hit Adventure Rank 35 and cleared Unbegun, Unending Story – welcome to Genshin's most demanding endgame content. Imaginarium Theater isn't your typical domain run. Each character gets exactly 2 Vigor points, and once they're spent fighting through combat stages, that's it. They're benched for the rest of your 10-act marathon.
Here's where it gets interesting: you'll collect Fantasia Flowers between battles to trigger helpful events. Some expand your roster (Companion Events), others buff your damage output (Brilliant Blessing Events). Think of it as strategic resource management meets combat puzzle.
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September's Shake-Up
Performance Tour Season 15 runs the entire month of September 2025, but here's the kicker – you're locked to Pyro, Hydro, and Dendro characters only. No Cryo, no Electro, no Geo, no Anemo. Period.
This restriction fundamentally changes how you approach damage dealing. Vaporize, Burning, and Bloom reactions become your bread and butter. The six Opening Characters (Hu Tao, Thoma, Xingqiu, Nilou, Collei, Baizhu) get a hefty 20% boost to HP, Attack, and DEF. Meanwhile, Special Guest Stars – that's Iansan, Chasca, Citlali, and Ineffa – receive double Blessing Level advancement.
What does double advancement mean? Faster access to those juicy reaction damage multipliers that'll carry you through the tougher acts.
New Systems Worth Understanding
The Supporting Cast feature lets you borrow one character per season – use them wisely, as each support character caps at 15 uses monthly. The Stella Rewards system adds another progression layer: nail 3, 6, or 9 Stellas from Star Challenges to earn Sanctifying Unction, Transient Resin, and Sanctifying Elixir.
Acts 3, 6, and 8 drop Toy Medals. These aren't just collectibles – they unlock unique Thespian Tricks character poses. A nice cosmetic bonus for your efforts.
September 2025 Rewards: Every Primogem Counts
The Primogem Breakdown
Monthly Performance Tour delivers a solid 800 Primogems across all 10 acts. But the distribution isn't even – boss acts pay better. Act 3's Maguu Kenki fight nets you 100 Primogems plus a Toy Medal. Act 6's Tenebrous Papilla matches this structure exactly.
The real payouts come later: Act 8's Potapo's Solidarity bumps up to 120 Primogems, while Act 10's final Lava Dragon Statue battle delivers 120 Primogems plus 10 Sanctifying Unction. Standard acts contribute 60 Primogems each – not spectacular, but they add up.
Beyond Primogems
Each act throws 50,000 Mora your way alongside Talent Books and Sanctifying Essence. That's 500,000 Mora monthly just from Performance Tour. First-time clearers get the Debut Performance bonus: 1500 Primogems and 800,000 Mora. Not bad for a one-time reward.
Boss acts sweeten the deal further. Act 3 includes 200 Primogems with 2 Fragile Resin, Act 6 adds a Midlander Billet Trove, and Act 10 caps things off with 250 Primogems plus a Crown of Insight.
Team Building: September's Meta Decoded
The Vaporize Powerhouse
Hu Tao teams dominate this season, and it's not even close. With her 20% Opening Character buff, she becomes an absolute monster. My recommended core: Hu Tao, Xingqiu, Candace, Yaoyao.
Why this combination? Xingqiu's damage reduction is clutch for Act 3's Maguu Kenki – those frost attacks hurt. His consistent Hydro application enables reliable Vaporize triggers, while Candace provides additional Hydro support and HP scaling that synergizes beautifully with Hu Tao's kit.
The Burning Alternative
For sustained damage across multiple acts, Burning compositions shine. Mavuika, Iansan, Citlali, Emilie leverages those Special Guest double progression bonuses for rapid Blessing advancement. This translates to high-frequency Pyro application – exactly what you need for Act 10's demanding mechanics.
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F2P Reality Check
Don't have the 5-star roster? No problem. Thoma, Xingqiu, Collei, Baizhu forms a solid Opening Character foundation using all available seasonal buffs. Gaming emerges as an exceptional F2P carry – his Plunging Attack damage scales beautifully with Vaporize reactions.
Pair Gaming with Xingqiu and Bennett, and you've got accessible high-damage potential that can clear all content.
Act-by-Act Strategy Deep Dive
Early Acts: Conservation Mode
Acts 1-4 are about smart resource management. Use Dendro-based Bloom reactions with Collei and Baizhu paired with Hydro supports. Save your premium Pyro units for the final gauntlet.
Act 3's Maguu Kenki requires positioning finesse. Bait the Galloping Frost variant toward the stationary ones for clustering – this maximizes your AoE efficiency. Xingqiu's damage reduction lets Hu Tao safely execute charged attacks without getting chunked.
Mid-Game Pressure
Act 6's Tenebrous Papilla throws a curveball: you need 53 elemental attacks within 15 seconds to prevent party-wide damage. Burning teams excel here due to continuous elemental application. Natlan characters provide triple-hit efficiency for barrier destruction – a significant advantage.
Act 8 introduces the Protection Spirit mechanic. Healing quantity directly correlates to boss damage output. Baizhu, Kokomi, Bennett provide premier healing options. Don't skimp on this – the damage difference is substantial.
The Final Gauntlet
Act 10's Lava Dragon Statue demands complex charge state management. Each Pyro hit contributes 1% charge, while 1U Pyro application adds 3.4% charge. Here's the catch: Hydro and Cryo attacks reduce charge by 22%.
The strategy? Rapid cycling using Arlecchino or Mavuika to trigger the 17-second Weakened State. During this window, damage amplification is significant enough to justify the setup investment.
Character Priorities: Who to Pull
The 5-Star Essentials
Mavuika and Arlecchino stand alone as premier Pyro carries for Act 10 performance. Their sustained Pyro application frequency is unmatched. Neuvillette offers versatility as both damage dealer and utility provider – his self-healing proves invaluable for Act 8's requirements.
Nahida remains the premier Dendro enabler. Her Elemental Mastery sharing and enemy debuffs enhance reaction scaling across all team compositions.
4-Star Workhorses
Xingqiu and Bennett form the accessible foundation most players rely on. Xingqiu provides damage reduction, healing, and consistent Hydro application – he's irreplaceable in most compositions. Xiangling offers exceptional off-field Pyro for Burning teams and Act 10 mechanics.
Collei and Yaoyao provide accessible Dendro application with those crucial Opening Character stat boosts.
Mastering the Buff System
Brilliant Blessing Strategy
The Brilliant Blessing system rewards commitment. Pick Vaporize or Burning trees early and invest your Fantasia Flowers for maximum late-game impact. Vaporize Blessings provide 1.5x and 2.0x multipliers – substantial damage amplification that compounds over time.
Burning Blessings offer consistent damage over time, valuable for sustained encounters and Act 10's charge mechanics. Don't spread yourself thin across multiple trees – focus pays off.
Elemental Application Frequency
Pyro application frequency determines success across multiple encounters. Mavuika, Arlecchino, and Xiangling represent your premier sustained application options. Hydro supports enable Vaporize reactions while providing utility through healing and damage mitigation.
Gear Recommendations That Actually Matter
Artifact Priorities
Crimson Witch of Flames provides 40% Overloaded, Burning, and Vaporize damage bonus – essential for Pyro carries. Heart of Depth serves Hydro carries with damage bonuses and Normal/Charged Attack amplification. Deepwood Memories provides essential Dendro RES reduction for reaction teams.
Weapon Tier Reality
Staff of Homa's HP-scaling damage bonuses synergize perfectly with Hu Tao's kit – it's her best-in-slot for good reason. Neuvillette's signature weapon provides specialized scaling that significantly outperforms alternatives. For Xingqiu, Sacrificial Sword enables optimal performance through skill reset mechanics and Energy Recharge substats.
Advanced Optimization Tips
Energy Management Mastery
Favonius weapons provide team energy generation through reliable critical hits. Battery characters like Bennett and Xiangling create energy synergy through particle generation. Master energy funneling – generating particles on one character while another receives energy – for consistent burst rotations.
Damage Optimization Techniques
Snapshot mechanics allow abilities to retain buff effects throughout their duration. Understanding elemental aura management determines reaction consistency. Vaporize teams need precise Hydro/Pyro timing, while Burning teams require consistent application patterns.
Animation canceling reduces downtime and improves rotation efficiency. Small optimizations compound over 10 acts.
F2P vs. Whale: Different Paths, Same Goal
Budget Success Stories
F2P completion is absolutely achievable using Thoma, Xingqiu, Collei, Baizhu with all Opening Character buffs active. Gaming-centered teams offer exceptional damage through Plunging Attacks and Vaporize scaling.
Long-term F2P success relies on strategic 4-star constellation investment over roster diversity. Better to have strong core units than weak 5-stars.
Investment Priorities for Spenders
Whale players should prioritize constellation and weapon refinements providing multiplicative scaling. Hu Tao's C1 eliminates stamina issues while improving damage output. Roster diversity enables optimal team compositions for each encounter type and strategic character allocation.
Your Most Pressing Questions Answered
What are the total Primogem rewards available in September 2025? You're looking at 2300 total Primogems: 800 from monthly Performance Tour plus 1500 from one-time Debut Performance. Boss encounters provide 100-250 Primogems each, while standard acts contribute 60-150 Primogems.
Which characters are absolutely essential for completion? Opening Characters (Hu Tao, Thoma, Xingqiu, Nilou, Collei, Baizhu) with their 20% stat boosts are crucial. Xingqiu is essential for Act 3's damage mitigation. High-frequency Pyro applicators like Arlecchino, Mavuika, or Xiangling are vital for Act 10. Dedicated healers are required for Act 8.
How do the elemental restrictions affect team building? September 2025's Pyro/Hydro/Dendro limitation emphasizes Vaporize, Burning, and Bloom reactions. Special Guest Stars bypass these restrictions with double Blessing progression, making them valuable investments.
What's the optimal Vigor management strategy? Use weaker characters for Acts 1-2, deploy a competent team for Act 3, return to weaker units for Act 5, then unleash your strongest roster for Acts 8-10. Save your best Pyro carries specifically for Act 10's demanding requirements.
How do Brilliant Blessing mechanics work? Purchase upgrades with Fantasia Flowers, prioritizing Vaporize and Burning trees. Focus investment on one reaction type for better late-game scaling rather than spreading resources across multiple trees.
Can F2P players complete all 10 acts? Absolutely, through strategic 4-star optimization and proper resource allocation. Essential characters include Xingqiu, Bennett, Xiangling, and Opening Characters. Gaming provides excellent F2P carry potential for Vaporize teams.