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See how to beat Forgotten Hall's Memory of Chaos Stage 12 in Honkai: Star Rail Version 3.6 with this guide! We've got the best teams, recommended characters, and rewards for Category Mistake here.
| Objectives | ♦ Win with at least 10 cycle(s) left ♦ Win with at least 20 cycle(s) left ♦ Have no downed characters |
|---|
| Category Mistake | |
|---|---|
| First Half | |
| Second Half |
| Category Mistake | |
|---|---|
| When an ally character has a summon, the DMG dealt by this unit and the summon increases by 40%. At the start of each Cycle, "Memory Turbulence" deals 1 instance of True DMG to all enemies, plus 1 additional instance of DMG for each ally summon, up to a maximum of 2 instances. | |
| Phase Duration | 10/27/2025 - 12/08/2025 |
| The Herta DPS | |||
|---|---|---|---|
The Herta | Jade | Robin | Huohuo |
| Castorice DPS | |||
Castorice | Evernight | Tribbie | Hyacine |
| Aglaea DPS | |||
Aglaea | Trailblazer (Ice) | Robin | Huohuo |
| F2P Team | |||
Serval | Herta | Asta | Lynx |
| Phainon DPS | |||
|---|---|---|---|
Phainon | Sunday | Cerydra | Permansor Terrae |
| Anaxa DPS | |||
Anaxa | Sunday | Cerydra | Permansor Terrae |
| Hysilens DoT | |||
Hysilens | Kafka | Black Swan | Permansor Terrae |
| F2P Team | |||
Trailblazer | Yukong | March 7th (Imaginary) | Permansor Terrae |
Enemies in the first half are weak to Ice and Lightning. We recommend using units that can deal AoE damage easily defeat the Flame Reaver's clones.
Enemies in the second half are weak to Physical. We recommend using units that can apply Shields to your team since it'll make fighting the Sweet Gorilla and the Judge of Oblivion easier.

For the first half, focus on the Furiae Praetor first since it can summon enemies and absorb its summons to deal massive damage if they're not taken care of. Once it is defeated, you can easily take out The Ascended next.

The Flame Reaver summons clones of itself that deal a lot of AoE damage if left unchecked, so focus on taking them out. Defeating them damages the Flame Reaver and also prevents it from using its final attack that deals massive damage.

For the second half, having a character that can apply Shields to your party is key to defeating the Sweet Gorilla and Judge of Oblivion easily. Having Shields reflects the Sweet Gorilla's attacks to itself.

The Judge of Oblivion's Hemotort Teethgrind attack inflicts massive single target damage, but if the character has a Shield it reduces the Judge's Toughness instead. This makes it easy to reduce its multiple Toughness gauges and inflict Weakness Break on it.
| Wave 1 Enemies | Weaknesses |
|---|---|
| Wave 2 Enemies | Weaknesses |
| Wave 1 Enemies | Weaknesses |
|---|---|
| Wave 2 Enemies | Weaknesses |
| All Rewards | ||
|---|---|---|
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| The Last Vestiges of Towering Citadel Stages | ||||
|---|---|---|---|---|
| Stage 1 | Stage 2 | Stage 3 | Stage 4 | Stage 5 |
| Stage 6 | Stage 7 | Stage 8 | Stage 9 | Stage 10 |
| Stage 11 | Stage 12 | Stage 13 | Stage 14 | Stage 15 |
| The Voyage of Navis Astriger Stages | ||
|---|---|---|
| Stage 1 | Stage 2 | Stage 3 |
| Stage 4 | Stage 5 | Stage 6 |
| Memory of Chaos Stages | |||
|---|---|---|---|
| Stage 1 | Stage 2 | Stage 3 | Stage 4 |
| Stage 5 | Stage 6 | Stage 7 | Stage 8 |
| Stage 9 | Stage 10 | Stage 11 | Stage 12 |
Clearly dev have never playtested V3.3 MOC12 while MOC11 is super ez. Not only Hoolay has so many consecutive moves, he also has a lot of HP. At this rate I think even until 2030 they won't reduce MOC12 boss' overly-inflated HP, not even worth playing. For those haven't tried, just go until MOC11 srsly
Memory of Chaos Stage 12 Guide for Version 3.6



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I don't know if this helps anyone but I finally this in under 10 turns using Hysilens/Kafka/Ruan Mei/Gallagher against Svarog. If you have Robin, you can switch her instead of Ruan Mei. For Aventurine, I did the standard Hyacine/Castorice/Tribbie/RTB. Tribbie had been using an S1 DDD! but I traded it out for an S5 Cogs. Way more Ults for Tribbie. Brute force, rely on Mem's True DMG and Action Advance and make sure to spend all of Pollux the turn before the Mad Party so you don't breath dice.