Players need four days to unlock the Truthful Trailblazer or Hidden Harmony secret achievements inHonkai: Star Rail. These hidden achievements are mutually exclusive and missable without some quick thinking and backtracking. Both achievements are also only unlockable after completing the multi-stage questline,Todd Riordan’s Academic Research.

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How to Start Todd Riordan’s Academic Research Glimpsing the Verdant Apothecary’s Pouch in Honkai Star Rail

This three-stage, four-dayHonkai: Star Railquest tree unlocksafter reaching Trailblaze Level 34 or above. Players must alsocompleteA Dragon Gallant, Its Ocean Distant, the second part of the Trailblaze Mission, Topclouded Towerthrust. The quest tree itself can end in two distinct ways, with one skipping a short section in favor of decisive action.

Glimpsing the Verdant Apothecary’s Pouch

The first part of Todd’s questline involves retrievingtwo Compendium of Remediesfrom the Alchemy Commission. Trailblazers are automatically whisked back to Todd, then requested to find a component froma mara-struck creature. They can acquire one after a fight with a disguised disciple of Sanctus Medicus at the Alchemy Commission.

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Unfortunate Healer Compendium of Remedies Honkai Star Rail

After activating the quest by talking to Todd in Central Starskiff Haven, Trailblazers should teleport to the Healer’s Market in the Alchemy Commission. They must speak to the NPC, Yuluo, who can be found beside the Dragon Tree in the middle of the market.

Gather The Books

After talking to Yuluo, players can find two copies of the Compendium of Remedies nearby.

Whichever order the player retrieves them, they will be teleported to Todd immediately after picking up both books.

Vase Compendium of Remedies Honkai Star Rail

Find The Learned Alchemist

Once Todd’s dialogue is finished, players should teleport back tothe Healer’s Market. The green-robed Learned Alchemist can be found behind the Dragon Tree. Winning the fight that follows will reward players with anEerie Twig, which must be brought back to Todd to finish this mission.

The Three Draconic Transformations

Todd will message the Trailblazer after one daily reset. This is the lengthiest section of the four-day quest, as players must possibly fight toclear puzzle areas. Players must also solve multiple visual puzzles that could be difficult to clear without a guide.

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give the textbook to todd Honkai Star Rail

After Todd sends the message, players should meet him at his usual spot in Central Starskiff Haven. He will ask the Trailblazer to take pictures of some landmarks in Scalegorge Waterscape.

Scalegorge Picture Locations

Upon receiving the pictures, Todd will make another request. The Trailblazer will be asked to find invisible rubbings left by hisIntelligentsia Guild mentor, Bernini Serrano. Scholar Bernini’s first set of invisible rubbings or Optical Markings can be found at the Alchemy Commission.

Find The Rubbings At The Alchemy Commission

Discover The Optical Markings At Scalegorge Waterscape

Although the Trailblazer does not recognize them, eagle-eyed players may remember them as The High-Cloud Quintet. Clockwise from the top, they are:

Xianzhou native

Learned Alchemist leads to battle Honkai Star Rail

Xianzhou Zhuming (Outsider, settled in)

Short-lived species

high elder statue vidyadhara egg vidyadha murals Honkai Star Rail

Tour Scalegorge Waterscape With Todd

Continued

Continuedtakes two days to complete. On the first day, players can choose whether to keep Todd’s secret or report him to the Ten-Lords Commission. The choice won’t change Todd’s ultimate fate but will affect his final moments.

Keep It A Secret

How to Unlock Truthful Trailblazer / Hidden Harmony

Lastly, to unlockthe hidden achievements, head back to Todd’s spot. In his place is Cleo, one of his many disciples. Players can unlockTruthful Trailblazerby telling her the truth about Todd.Hidden Harmonyis unlocked by keeping Todd’s secret.

Honkai: Star Railis available for mobile, PS5 and PC.

Report To The Ten Lords Commission Honkai Star Rail

Keep It A Secret Honkai Star Rail

Honkai Star Rail Tell Cleo the truth for Truthful Trailblazer or hide it for Hidden Harmony