Thiollier and St. Trina are NPCs you’ll meet at the Three-Path Cross Site of Grace early on in Elden Ring’s Shadow of the Erdtree DLC.
At first, Thiollier is just a vendor for poison-related items, but his full story — along with St. Trina’s — will take the rest of your time in the Shadow Realm to play out.
Our Elden Ring DLC guide will walk you through where to find Thiollier and St. Trina, and all the steps you’ll need to take to complete their questline.
Thiollier and St. Trina locations
You’ll meet Thiollier first near the Pillar Path Cross Site of Grace in Gravesite Plain. You can reach him there before you take on Castle Ensis.
Later, after you enter Shadow Keep, you’ll be able to find St. Trina in the Cerulean Coast at the Garden of Deep Purple Site of Grace, and Thiollier will move to be with her there.
Thiollier first meeting in Graveyard Plain
There’s not really a rush to go find Thiollier at his initial location by Pillar Path Cross Site of Grace, but, since his questline overlaps with Moore’s, it’s probably best to get that initial meeting out of the way early before things get complicated. You can get there before tackling Castle Ensis by crossing Ellac Greatbridge, and then just taking the right inside the solider camp.
Once you reach the Pillar Path Cross Site of Grace and Miquella’s Cross, chat with Thiollier and exhaust his dialogue.
Check in with Moore after meeting Thiollier
After you have your first talk with Thiollier, head back to the Main Gate Cross Site of Grace in front of Belurat. Check in with Moore and talk to him, and he’ll give you some Black Syrup for Thiollier.
Head across to Pillar Path Cross Site of Grace to give the Black Syrup and then ask about the Black Syrup. Choose I’m tired of life next, and Thiollier will hand you Thiollier’s Concoction. This is an item you’ll use with the Dragon Communion Priestess on Igon’s questline.
Break the great rune (and the charm)
Before you can make any more progress, you need to break a great rune that’s blocking your path. You probably haven’t even seen it yet, but it’s time to get it out of the way.
To break it, you need to approach Shadow Keep. Just before you reach the front door, you’ll get a pair of messages — “Somewhere, a great rune has broken…” and “And so too has a powerful charm.” These both generally relate to Miquella and the NPCs you’ve met so far. For Thiollier and St. Trina specifically, the great rune was blocking a path you’ll need to head to now.
Reach the Stone Coffin Fissure and defeat the Putrescent Knight
All the way at the southern tip of the Southern Shores, there’s a fissure you can climb (fall) down. That’s your next stop. At the bottom, you’ll find the The Fissure Site of Grace at the entrance to the Cerulean Coast and the Stone Coffin Fissure — this is where the rune we broke was blocking your progress.
A bit further along, you’ll face the Putrescent Knight and unlock the Garden of Deep Purple Site of Grace. Once you do, you’ll be right near where St. Trina has been hiding.
Head into the tunnel by the Garden of Deep Purple Site of Grace to meet St. Trina. She’s not very talkative. Don’t do anything with her yet. Instead, leave and then go check in with Thiollier.
Tell Thiollier about St. Trina’s whereabouts
Go back to the Pillar Path Cross Site of Grace and speak with Thiollier. Tell him St. Trina’s whereabouts, and he’ll relocate.
Imbibe the nectar
The next part of their questline is a little confusing (and dark). Head back to the Garden of Deep Purple and go chat with Thiollier.
Ignore his warnings, and go talk to St. Trina. When you have the option, choose to imbibe nectar. Just like Thiollier said, this will kill you immediately. That’s the plan, though, so trust the process.
Keep respawning at the site of grace and then imbibing the nectar over and over — four times in a row — until you start hearing St. Trina’s voice on the black screen before you respawn.
Defeat Thiollier
Once you hear St. Trina’s words, head back and try to pass the message on to Thiollier. It’ll take two tries, and he won’t be receptive.
Imbibe the nectar (and die) again. You’ll hear a bit more from St. Trina in the darkness.
When you respawn, you’ll get invaded by Thiollier. Defeat him to pick up the St. Trina’s Smile talisman.
Pass on St. Trina’s words
Head into the cave and talk to Thiollier again. Drink the nectar again. Die again.
This time, when you respawn and speak to him again, Thiollier will finally hear you out. Pass on St. Trina’s words to him.
Burn the Sealing Tree
St. Trina and Thiollier’s questline won’t come to an end for a while. You’ll have to finish Shadow Keep, cross the Rauh Ruins, defeat Romina, Saint of the Bud at the Church of the Bud, and then finally use Messmer’s Kindling to burn the Sealing Tree.
That will open the Tower of Shadow and teleport you to the Enir-Ilim: Outer Wall Site of Grace in Enir-Ilim. Before you explore too far, though, it’s time to check in on Thiollier one last time.
Talk to Thiollier
Head back to the Garden of Deep Purple and talk to Thiollier — he won’t have much to say. Imbibe St. Trina’s nectar again, hear what she has to say now, and then return to Thiollier.
He probably still won’t have anything to say, but this will ensure you can summon him for…
Summon Thiollier to fight Leda and her allies
After you make it all the way through all of Enir-Ilim, you’ll come to a large arena where you face off against Needle Knight Leda and her allies — Redmane Freyja, Dryleaf Dane, and, possibly, Sir Moore.
You can summon Thiollier and, if you’ve followed his questline, Sir Ansbach to aid you in the fight.
Thiollier’s fight isn’t over yet.
Summon Thiollier for the final boss fight
After defeating Leda, you’ll make your way up to the Divine Gate for the game’s final boss fight. Before you step through the fog wall, there will (might) be summon signs for your allies, Ansbach and Thiollier.
No matter how the fight goes down, rest at the new Gate of Divinity Site of Grace. After, you’ll find Thiollier dead nearby where you can pick up Thiollier’s Hidden Needle and Thiollier’s set of armor. (Ansbach may be here as well.)
Receive St. Trina’s Blossom
With the fight done, head back to the Garden of the Purple Deep one last time. You’ll find St. Trina dead as well, but she left you the St. Trina’s Blossom (quite fetching) headgear.
Looking for more Shadow of the Erdtree guides? Check out our guides on the Count Ymir, Dryleaf Dane, Hornsent Grandam, Sir Ansbach, and Redmane Freyja NPC quests, or peruse our interactive Elden Ring DLC map.
