HSR Sunday Boss Guide: How to Defeat Harmonious Choir The Great Septimus

In Short
  • Sunday. Harmonious Choir The Great Septimus, is the final boss in the Honkai Star Rail 2.2 Trailblazing missions. He has a massive Toughness and health bar with strong damage-dealing attacks.
  • To defeat him, choose characters with Fire, Lightning, and Imaginary damage types, and make sure they have multi-target attacks. Also choose characters scaling on Break Effect and use Break Effect relics, if possible.
  • Focus on weakness breaking the Choir minions first, and then target the Great Septimus. During the third phase, only focus on breaking the 10 layers of toughness bar on Sunday.

Honkai Star Rail 2.2 missions featured one of the most bizarre incidents in the game’s history, completely juking the player base into believing a dream over reality. Once players finally snap back to reality, they are faced with an incredibly hard challenge. The Sunday boss fight, the Harmonious Choir The Great Septimus, is one of the hardest challenges in the game, especially for players who approach the fight in the wrong way. Here I have given the Sunday’s weakness and provided a completed HSR Sunday boss guide.

What Makes the Sunday Boss Fight Hard

Sunday Boss Fight Harmonious Choir the Great Septimus
Image Courtesy: In-game Screenshot (Captured by Sanmay Chakrabarti)

The Sunday, Harmonious Choir The Great Septimus, the boss fight is difficult because players enter the battle without the proper characters. The Sunday boss fight is based on break-effective damage, and bringing in characters that don’t have the correct damage type can make the fight extremely hard.

Other than that, this fight is much easier with characters that have AoE or Blast attacks. Weakness breaking the minions of the Great Septimus prevents it from dealing high damage and also provides shields to the team. If you have many single-target characters in the team, it can be hard to weakness break all the enemies on the battlefield, forcing your characters into a high amount of damage taken from the enemy.

Best Characters and Teams for the Sunday Boss Fight in HSR

Image Courtesy: In-game Screenshot (Captured by Sanmay Chakrabarti)

This fight can be a piece of cake with the correct characters. Here is how you need to pick your characters to exploit Sunday’s weaknesses.

  • First, you need to pick characters with the Fire, Lightning, and Imaginary damage types. At least 3 of the team characters should have these damage types to make the fight easier.
  • The next thing you need to do is pick characters with AoE and Blast attacks. This way your characters will easily Weakness break the Choir minions and the Great Septimus. Characters with Ultimate AoE are also great for this fight. This is also true for Sustains and Support characters.
  • Use relics with high Break Effects on characters if possible and also use characters that scale on Break Effect. Characters like Ruan Mei and Gallagher are very good for this fight.
AcheronRuan MeiGallagher
Jing YuanGuinaifenAventurine
Dan Heng Imbibitor LunaeAstaLuocha
HimekoTopazFu Xuan
ServalTingyunFire Trailblazer (For Echo of War)
Best Characters for Sunday Boss Fight

The best teams for the Sunday boss fight are:

Main DPSSupportSupportSustain
AcheronRuan MeiWeltLuocha
Dan Heng Imbibitor LunaeRuan MeiTingyunAventurine
Jing YuanTopazAstaAventurine
Best Teams for Sunday Boss Fight

HSR Sunday Boss Fight Strategy

When fighting the Harmonious Choir, the main thing you need to focus on is weakness breaking all the minions as quickly as possible. Once you have weakness-broken all the Choir minions, focus on weakness-breaking The Great Septimus to deal Super Break damage. The Sunday boss’s weakness is weakness break, so continue doing that to easily win the fight.

Image Courtesy: In-game Screenshot (Captured by Sanmay Chakrabarti)

During the third phase of the fight, you only need to focus on weakness-breaking The Embryo of Philosophy Sunday. He will have 10 layers of Toughness, and the more you break, the more you receive the shield to block the damage. Do not waste your turn by buffing your characters during the last phase. Only use buffs from the Ultimate, and focus on chipping down his toughness bar.

If you are able to completely deplete his toughness bar in the last phase, then you can easily defeat him without worrying about taking damage.

Comments 4
  • Matt says:

    This is great for the first Sunday fight, but what about the second? It’s near impossible unless you have a full party of maxed out 5 star whale characters.

    • Sanmay Chakrabarti says:

      Not really, you can use Asta, Gallagher/Luocha, Harmony Trailblazer, and a strong DPS 5-star unit with the weakness type mentioned to win the fight comfortably.

  • BB says:

    Goddamnit i dont own almost any of the “recommended” chracters, i guess ill die.

    • Matt says:

      First Sunday fight can be done with Fire MC, Gallagher, and March with a decent healer (I had Luocha).

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