The main story of Kingdom Come: Deliverance 2 follows a linear path that will guide Henry and his companion through their journey. However, if you focus solely on the main story, you’ll miss out on some of the unique and fun side quests that you can undertake by meeting various quest givers.
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Halfway through the game, you will reach the second region, Kuttenberg, which is noticeably larger than the previous region, Trosky. There is more to explore here, more to see, more characters to meet, and of course, more quests to complete. The Reliquary is just one of many.
How To Start The Reliquary Quest
After completing the Speak of the Devil quest, head to the forest edge northwest of Sedletz Monastery in the Kuttenberg Region, where you will find a small camp with a knight standing there.
Speak to him, and he will ask for your help in finding a specific item for him: 
Sword of Sir Valentine
, which is located in the underground basement at the monastery.
How To Find The Sword of Sir Valentine
Make your way to the Sedletz Monastery and enter the chapel. In the center, you’ll find a hole in the wall; go through it to reach the underground area.
From here, head to the entrance on the left side. At the end of this room, you’ll find a sarcophagus.
Interact with it to open it, and Henry will make a comment.
Next, interact with the base of the sarcophagus where it says ‘Examine the lid’, and you’ll be able to obtain the drawing of the sword, which you can use to forge it later.
How To Complete The Reliquary Quest
After obtaining the drawings of the sword, you need to forge a replica of it, which can be done at any Blacksmith station. Before starting, make sure you have all the required materials, which are:
These can be bought from any Blacksmith or Armorer, except for the Cow skin, which can be purchased from any Butcher in Kuttenberg.
With all the materials ready, begin the forging process, which is the same as any other sword forging. Once completed, you will have the Sword of Sir Valentine.
Take the sword back to the knight’s location and hand it over to him. Unfortunately, he will try to kill you to avoid putting himself at risk.
At this point, you’ll need to either pass a Very Hard Presence skill check or fight him; the choice is yours.
If you succeed in the Presence skill check, he will be intimidated and won’t attack you. Instead, he will give you St. Appolonia’s tooth which is a useless item.
However, if you fail, you’ll have to kill him, so you might as well choose that option right away.
Whatever option you go for, it will mark the completion of the Reliquary quest.
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