Thiollier and St. Trina's Quest

Key takeaways

Keep the quest moving by revisiting Thiollier after the Great Rune event, completing the repeated nectar interaction and exhausting every new conversation before leaving each location.

• Start at Pillar Path Cross Find Thiollier at the Pillar Path Cross Site of Grace and exhaust his dialogue. His early conversation is the foundation for the later St. Trina branch.
• Wait for the Great Rune event After Miquella's Great Rune is shattered, speak to Thiollier again before searching the southern coast. This dialogue changes his objective and points the quest toward St. Trina.
• Use the nectar repeatedly At St. Trina's location, drink the nectar even though the interaction kills you. Return and repeat the action until St. Trina's dialogue progression has advanced.
• Treat the summon signs as optional but valuable Thiollier can assist against the Putrescent Knight and in the final boss encounter. The fights remain possible without him, but his summon route supports the full quest outcome.
• Return after the final boss The character quest's final rewards are tied to returning to St. Trina's area after the expansion's final boss. Check the area again before considering the quest complete.

Overview

Thiollier and St. Trina's Quest is a Shadow of the Erdtree character quest about a poison specialist searching for the mysterious St. Trina. Its central route runs from the Pillar Path Cross through the Cerulean Coast and Stone Coffin Fissure, and it intersects with the Putrescent Knight and the expansion's final battle.

Thiollier first appears at the Pillar Path Cross Site of Grace, where he presents himself as a timid merchant with an unusual connection to poison. Speak with him repeatedly rather than treating the first conversation as a complete introduction; exhausting his dialogue establishes his interest in St. Trina and makes later changes in his location and dialogue easier to track. His quest is separate from the main objective, but it uses the same world-state changes that affect several followers of Miquella.

The route to St. Trina begins after Miquella's Great Rune is shattered. Return to Thiollier and exhaust his new dialogue, then travel south toward the Cerulean Coast. The Stone Coffin Fissure is the important landmark: the entrance leads into a vertical underground area, and the route eventually reaches the Garden of Deep Purple, where St. Trina is found. The fissure is not a short conversation stop; it is a dungeon route with a major boss at its end.

St. Trina's nectar is the quest's defining mechanic. Drinking it kills the player character, so the first attempt looks like a normal death rather than a successful interaction. Continue returning to St. Trina and drink the nectar repeatedly until the hidden dialogue progression is exhausted, then report what was learned to Thiollier. Do not stop after the first death, and do not assume that the death itself has reset the quest.

After Thiollier learns of St. Trina, he can participate in the Putrescent Knight encounter and later in the final confrontation. His summon signs are optional, so declining them does not prevent the player from finishing the associated fights, but using the quest's dialogue and summon opportunities is important for receiving the complete character-focused aftermath. The final rewards are obtained by returning to St. Trina's area after the expansion's final boss rather than by assuming every reward appears immediately after the boss fight.

Where this sits

Requirements

The quest requires access to the relevant southern Shadow Realm areas and a world-state change before its central objective becomes available.

• RequiredShadow of the Erdtree accessThe quest takes place in the Shadow Realm and cannot be started in the base game's regions.
• RequiredPillar Path Cross accessReach the Pillar Path Cross Site of Grace to find Thiollier and begin his dialogue chain.
• RequiredMiquella's Great Rune eventProgress the expansion until Miquella's Great Rune is shattered, then revisit Thiollier for the next stage.
• RequiredCerulean Coast routeReach the southern coast and locate the entrance to Stone Coffin Fissure.
• RequiredStone Coffin Fissure completionNavigate the fissure far enough to reach the Garden of Deep Purple and St. Trina.
• RecommendedA way to survive repeated deathsThe nectar interaction kills the player character, so preserve enough time and resources to return to St. Trina's chamber several times.

Objectives

1. Speak with Thiollier at Pillar Path Cross.Exhaust his initial dialogue before moving on.
2. Return to Thiollier after Miquella's Great Rune is shattered.His new dialogue redirects the quest toward St. Trina.
3. Find St. Trina in the Garden of Deep Purple.Enter Stone Coffin Fissure from the Cerulean Coast and follow the dungeon route.
4. Drink St. Trina's nectar repeatedly.Accept the death caused by the interaction and repeat it until the dialogue progression advances.
5. Tell Thiollier what St. Trina revealed.Return to Thiollier after the nectar sequence and exhaust his response.
6. Complete the Putrescent Knight encounter.Thiollier's summon sign can be used if the quest has been advanced correctly.
7. Use Thiollier's later summon opportunity.A further summon sign can appear for the final boss encounter.
8. Return to St. Trina's area after the final boss.Search the chamber for the quest's concluding rewards.

WalkthroughSpoilers

1. 01

   Begin Thiollier's character quest.

   Find Thiollier at Pillar Path Cross

   Travel to the Pillar Path Cross Site of Grace and look for Thiollier nearby. Speak to him until his dialogue repeats; stopping after one line can make it unclear whether the quest has actually started.

   Location: Pillar Path Cross

   TipUse the Site of Grace to reset dialogue if Thiollier has no new line immediately.

   Watch outDo not leave the area without exhausting his conversation, because later steps are keyed to his completed dialogue.

2. 02

   Reach the quest's first progression trigger.

   Progress until Miquella's Great Rune is shattered

   Continue through the Shadow Realm until the event involving Miquella's Great Rune occurs. This is the world-state trigger that changes Thiollier's concerns, so searching the fissure before this point will not provide the full quest progression.

   TipWhen a major Miquella-related world event occurs, revisit the NPCs connected to Miquella before pushing deeper into new regions.

   Watch outAdvancing too far through the expansion without checking Thiollier can move the quest past a dialogue opportunity.

3. 03

   Receive Thiollier's St. Trina-related progression.

   Return to Thiollier and exhaust his new dialogue

   Go back to Pillar Path Cross after the Great Rune event and speak with Thiollier again. His conversation now establishes that he is pursuing St. Trina, which is the signal to begin the southern-coast route.

   Location: Pillar Path Cross

   TipRepeat the conversation until he stops adding new information rather than relying on the first post-event line.

   Watch outDo not assume that reaching the Cerulean Coast alone advances this stage; the return conversation is the important trigger.

4. 04

   Locate the route to St. Trina.

   Reach the Cerulean Coast

   Travel south through the Shadow Realm to the Cerulean Coast. Search the coast for the entrance to Stone Coffin Fissure; the quest does not resolve at the coastline itself, and the required destination lies below ground.

   Location: Cerulean Coast

   TipKeep the area name in mind while exploring: the fissure is the landmark to look for, not a separate NPC marker for St. Trina.

   Watch outEntering the coast before speaking with Thiollier can leave the quest state unclear, so complete his dialogue first if the route appears inactive.

5. 05

   Reach the Garden of Deep Purple.

   Descend through Stone Coffin Fissure

   Enter Stone Coffin Fissure and follow its descending path through the underground area. Continue beyond the initial sections until the route reaches the Garden of Deep Purple; reaching the dungeon entrance is not enough to activate the St. Trina interaction.

   Location: Stone Coffin Fissure

   TipTreat the fissure as a full dungeon route and activate any available checkpoints before attempting the deepest section.

   Watch outThe route ends in a major encounter, so do not spend all healing resources on the descent if you are not ready to fight.

6. 06

   Start the nectar sequence.

   Find St. Trina in the Garden of Deep Purple

   After descending through Stone Coffin Fissure, enter the Garden of Deep Purple and locate St. Trina's chamber. Approach the interaction point and select the option to drink St. Trina's nectar; the resulting death is part of the quest rather than a normal combat failure.

   Location: Garden of Deep Purple

   TipRemove any assumption that the first death means the interaction failed; return to the chamber and attempt it again.

   Watch outThe nectar kills the player character, so spend or secure anything you do not want to risk before repeating the interaction.

7. 07

   Obtain St. Trina's message.

   Repeat the nectar interaction

   Return to St. Trina after each death and drink the nectar again. Continue until the interaction produces the required dialogue progression; a single attempt is not sufficient, and the player must deliberately repeat the cycle rather than abandoning the chamber.

   Location: Garden of Deep Purple

   TipUse the nearest available route back to the chamber and check for new dialogue after every attempt.

   Watch outLeaving after the first death or treating the nectar as a one-time item can stall the quest at its most distinctive step.

8. 08

   Move Thiollier into the next stage of his search.

   Report St. Trina's message to Thiollier

   Once St. Trina's dialogue progression has advanced, return to Thiollier and tell him what was learned. Exhaust his response, then use a Site of Grace or another reload if necessary so that his next state becomes available.

   TipIf Thiollier appears unchanged, rest and speak with him again rather than immediately abandoning the quest.

   Watch outDo not skip the post-nectar conversation before defeating the associated boss, because the later summon and aftermath depend on the quest state.

9. 09

   Defeat the Putrescent Knight and continue Thiollier's quest.

   Prepare for the Putrescent Knight

   Return to the Garden of Deep Purple and proceed to the boss encounter against the Putrescent Knight. If Thiollier's summon sign is present, it can be activated before entering the arena; the summon is assistance, not a requirement for victory.

   Location: Garden of Deep Purple

   TipCheck the floor around the boss entrance for Thiollier's sign before crossing the fog, and summon before entering if you want his support.

   Watch outEntering the arena without checking the sign can mean missing that opportunity for the current attempt.

10. 10

    Resolve the immediate St. Trina conversation.

    Speak with Thiollier after the boss

    After defeating the Putrescent Knight, revisit the relevant dialogue position and speak with Thiollier about St. Trina. Continue until his dialogue is exhausted; the quest is not complete merely because the boss has been defeated.

    TipReload the area if Thiollier does not update immediately after the boss victory.

    Watch outDo not rush to the final boss without checking for this dialogue, because quest NPCs can stop offering earlier lines after major progression.

11. 11

    Bring Thiollier into the final confrontation if desired.

    Use Thiollier's final summon opportunity

    When the final boss encounter becomes available, look for Thiollier's summon sign in the boss arena and activate it if you want to complete his combat participation. The sign is optional, and the final boss can be fought without it.

    Location: Final boss arena

    TipSearch the arena carefully before beginning the fight; summon signs can be overlooked when the encounter is already active.

    Watch outDefeating the final boss before checking for the summon can remove the opportunity to use it in that playthrough state.

12. 12

    Collect the quest's concluding rewards.

    Return to St. Trina after the final boss

    After defeating the expansion's final boss, travel back to the Garden of Deep Purple and inspect St. Trina's area. Speak or interact with the remaining quest elements and collect the available character and St. Trina rewards before leaving.

    Location: Garden of Deep Purple

    TipThe final boss victory does not necessarily place every reward in your inventory automatically; revisit the original chamber.

    Watch outDo not mark the quest complete until the post-boss area has been checked, because the aftermath is located away from the final boss arena.

Mission mechanics

The quest uses dialogue flags rather than a conventional item checklist. Thiollier's location and available lines change after Miquella's Great Rune is shattered, after the player interacts repeatedly with St. Trina and after the Putrescent Knight is defeated. Resting at a Site of Grace or reloading the area is a practical way to refresh an NPC state when the next line does not appear immediately.

St. Trina's nectar is intentionally presented as a dangerous interaction. Each use kills the player character, but the death is the method for advancing the conversation. The correct response is to return to the same chamber and repeat the action; ordinary healing, equipment changes or defeating nearby enemies do not replace this required sequence.

The quest overlaps with two optional summon opportunities. Thiollier can assist with the Putrescent Knight and can later be summoned for the final boss, but neither summon is mandatory for the corresponding victory. The important distinction is between winning the fight and preserving the quest state: a player can defeat a boss while still missing dialogue that would have made the associated summon available.

The final state is checked at St. Trina's location after the expansion's final boss. This makes the quest easy to misread as unfinished if the player expects a reward directly from the boss arena. Return to the Garden of Deep Purple, inspect the chamber and collect anything left by the quest's conclusion.

What works and what does not

Choices and consequencesSpoilers

• Drink St. Trina's nectar again after it kills the player.

  The death advances the intended quest interaction; repeating the action is required to reveal the relevant progression.

• Summon Thiollier for the Putrescent Knight.

  Thiollier participates in the boss fight. Declining the sign leaves the fight available as a solo encounter but forfeits that opportunity for the attempt.

• Summon Thiollier for the final boss.

  Thiollier joins the final confrontation if his quest state and summon sign are available. The final boss remains beatable without him.

  Spoiler
• Defeat the final boss before checking Thiollier's dialogue and summon sign.

  The final-boss summon opportunity can be lost, and the quest may no longer provide the intended combat sequence.

  Spoiler
• Return to St. Trina's chamber after the final boss.

  This reveals the quest's aftermath and allows the player to collect the concluding rewards.

  Spoiler

Checklist

• Speak with Thiollier at Pillar Path Cross.Exhaust his opening dialogue.
• Revisit Thiollier after Miquella's Great Rune is shattered.Confirm that his objective has changed to St. Trina.
• Reach the Cerulean Coast.Locate the southern route to Stone Coffin Fissure.
• Descend through Stone Coffin Fissure.Continue to the Garden of Deep Purple.
• Drink St. Trina's nectar repeatedly.The resulting deaths are intended quest progress.
• Return to Thiollier after the nectar dialogue advances.Exhaust his new conversation.
• Check for Thiollier's Putrescent Knight summon sign.Optional combat support.Optional
• Defeat the Putrescent Knight.Required for the associated progression.
• Check for Thiollier's final-boss summon sign.Do this before entering or beginning the final encounter.Optional
• Defeat the expansion's final boss.This unlocks the final aftermath check.
• Return to St. Trina's area.Collect the concluding rewards.

Collectibles and secretsSpoilers

• 01
  St. Trina's nectar

  Where: Garden of Deep Purple

  The quest interaction is consumed repeatedly to advance St. Trina's dialogue. It kills the player character each time, so it functions as a progression mechanic rather than a conventional consumable reward.

• 02
  St. Trina's Smile

  Where: St. Trina's area after the expansion's final boss

  A St. Trina-related talisman obtained during the quest's aftermath. Return to the Garden of Deep Purple after the final boss to check for it.

  Missable
• 03
  Thiollier's equipment

  Where: Quest aftermath in or around St. Trina's area

  The concluding state can provide Thiollier-related equipment, including his characteristic weapon and equipment rewards. Inspect the area after the final boss rather than leaving immediately.

  Missable

Failure conditionsSpoilers

• Failing to revisit Thiollier after Miquella's Great Rune is shatteredThe quest can remain at its earlier dialogue state, preventing the intended St. Trina route from becoming clear.
• Stopping after the first nectar deathThe interaction is designed to be repeated. Leaving after one attempt does not complete St. Trina's dialogue progression.
• Skipping post-nectar dialogueThiollier's later state and summon opportunities depend on reporting the message and exhausting his response.
• Defeating the Putrescent Knight before checking the available summon signThe boss victory can remove the immediate opportunity to summon Thiollier for that encounter.
• Starting or defeating the final boss without checking Thiollier's signThe final-boss summon opportunity may be missed once the fight has advanced or ended.
• Not returning to St. Trina after the final bossThe quest's final rewards and aftermath are not necessarily delivered in the final boss arena.

RewardsSpoilers

• St. Trina's Smile
  A talisman associated with St. Trina, obtained during the quest aftermath after returning to St. Trina's area following the expansion's final boss.
• Thiollier's Hidden Needle
  A Thiollier-related weapon reward associated with completing his character quest and checking the concluding aftermath.
• Thiollier's equipment
  The quest's final state can leave Thiollier-related equipment in the aftermath area. Search the Garden of Deep Purple rather than expecting the items to appear at the final boss.
• Thiollier as a summon
  Not an inventory item, but an important practical reward of advancing the quest: Thiollier can provide optional assistance in the Putrescent Knight and final boss encounters when his signs are available.

Characters in this mission

• ThiollierThe quest giver and poison specialist searching for St. Trina.
• St. TrinaThe figure whose nectar and hidden dialogue form the quest's central mechanic.
• Putrescent KnightThe boss at the end of the Garden of Deep Purple route.

AftermathSpoilers

Trivia

• Thiollier's quest makes the player character's death part of the intended solution: the nectar interaction appears hostile, but repeating it is how the hidden dialogue progresses.
• The quest links a poison-focused merchant to St. Trina, turning Thiollier's gameplay identity into the route's central narrative clue.
• Thiollier's storyline is unusual in that its important locations are separated by a large outdoor journey and a vertical dungeon, while its progression remains controlled primarily by NPC dialogue flags.
• The quest's optional summon signs connect a supporting character's personal story to both an underground boss encounter and the expansion's final confrontation.

Relationships