Honkai: Star Rail Memory of Chaos Stage 9 Guide (V2.2 – A Song’s True Theme)

Memory Turbulence

At the start of every wave of Cycle, summon 1 Trotter onto the field. The Trotter will be immediately defeated when it is Weakness Broken.
After the Trotter is defeated, Advance the attacker's Action Forward by 100%, then apply Memory Imprint to all allies. Every stack of Memory Imprint then apply Memory Imprint to all allies. Every stack of Memory Imprint increases the target's ATK by 15% and Break Effect by 30%, up to a max of 5 stack(s).

Enemies Lineup

First Half

Second Half

Team Recommendations

First Half

Recommended Elements: Wind & Ice
The Apes in this stage can only do a single-target attack. You can return the favor and also bring a single-target DPS or Blast so you can focus on hitting this elite enemy. Lightning isn't recommended here because the Shape Shifter in the second wave has a Lightning RES.

Second Half

Recommended Elements: Fire & Ice
Just like the first half, single-target DPS is viable in this half because focusing on one single enemy is much better than AoE attacking all of them, since that means that the enemies will be much longer on the stage since AoE attacks will only chip their HP slowly.

Observation

A Song’s True Theme First Half: Abundance Sprite: Malefic Ape & Disciples of Sanctus Medicus: Shape Shifter

• In the first wave, there are many enemies. Hover over the Trotter and check if your DPS can Weakness Break in one move. If you can, definitely go for the Trotter first because once you Weakness Break it, your DPS will have their turn again immediately, while also getting bonus ATK and Break Effect.
• Among the enemies, focus on the Wooden Lupus (white dog) first because it can summon a Shadow Jackhyena. Any summoner is bad so delete them first.
• After that, Golden Hound is next before the Malefic Ape. The black isn't that threatening so you can also ignore it and focus on the Ape first. It's up to you.
  • The Malefic Ape will focus and target the last character that uses Skill, so you should time your Skills wisely, or just make sure the last one using Skill has a decent HP because the Ape deals huge single-target DMG. Look at the left corner to see your character and enemies’ rotation to decide who will be the last one using Skill to trigger the Malefic Ape gaze.

• In the second wave, there's another Ape and Shape Shifter. Like I said, any summoner on the opposite side is bad so focus on the Shape Shifter first to block him from summoning any other enemies.
• If the boss manages to summon more mobs, there are multiple methods to deal with it:
  • If you bring Pela (or any character that can remove debuff) when fighting the Shape Shifter boss. Use her Skill to remove the hit recovery buff of the Disciples, otherwise, that elite enemy can absorb a LOT of HP and make him pretty invisible since he keeps healing.
  • If you don’t have Pela (or any character that can remove a debuff on enemies), another option is to defeat the two Mara-Struck Soldiers that he summons until they die for the first time. After they use their Rebirth skill (revive and restore 50% HP), it won’t matter anymore, and move on to the next Mara-Struck Soldier. Only after the 2 Mara-Struck Soldiers are gone will the hit recovery buff on the elite enemy disappear.

A Song’s True Theme Second Half: "Present Inebriated in Revelry" & "Tomorrow in Harmonious Chords"

• In the first wave, there are many mobs and one elite enemy. If you bring a single-target DPS, I suggest defeating the mobs first before the elite enemy. But if you bring an AoE DPS, focus on the elite enemy since the AoE attacks should be enough to defeat the mobs after a few turns.
• Present Inebriated in Revelry is like Black Swan in terms of skill where it will inflict DoT on your characters and when it's his turn again, he will deal his ultimate attack. The damage is not that high.

• In the second wave, there are 2 elite enemies. If you bring a single-target DPS, focus on the "Tomorrow in Harmonious Chords" first because she has the ability to put your character to sleep with Alien Dream debuff. Of course, you can remove the debuff with a cleanser.
• About the Domescreen, this one can be left alone since it can bring some advantage to your team, BUT ONLY if it's in the Surprise Channel. It has 2 channels: Surprise Channel & Fright Channel. After being attacked, this unit will switch from the Surprise Channel status to the Fright Channel status, or vice versa.
  • Surprise Channel: Regenerates Energy for a random target.
  • Fright Channel: Deals minor Quantum DMG to all targets (your team) and causes all targets to lose Energy.