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InKingdom Come: Deliverance 2, each quest offers a unique interaction between Henry and the characters found in both regions of the game. Some quests focus on serious matters, while others are lighthearted or even a bit silly. Additionally, there are quests that can be triggered while you’re already working on another.
One such example is the Primum Nil Nocere quest. This one can only be triggered if you decide to help the poor lady, Mlada. If you don’t assist her, you will miss out on the quest and won’t be able to complete it. For completionists who want to experience every available quest, this guide will show you how to make sure you don’t miss this one.

This is a missable quest.
How To Start Primum Nil Nocere Quest
ThePrimum Nil Nocerequest can only bestarted and completed toward the end of the Thunderstone side questin the game, where you need to find theThunderstone.
Whenyou meet Mlada,ask her about the stone. Mlada does have the stone, and she believes it will help heal her husband, Peter.

We have a complete guide on how tostart and complete the Thunderstone questhere if you need help with that.
As part of a deal,she will ask you to help treat her husband, and in exchange, she will give you the Thunderstone.

How To Complete Primum Nil Nocere Quest
How To Treat Peter
In the bedroom,you will find Peter lying on the bed sick. you’re able to interact with him toexamine him. Do both options, but you won’t get any results.
Interrupt the examinationand gospeak to Mlada again for a bit more information. This will give you an additional dialogue option when you speak to Peter next, which says ‘You don’t sleep much at night?’
After completing the conversation with him, you will now know what needs to be done. If you don’t,you need to give himChamomile Brew.
If you already have one in your inventory, you will have the option to hand it over to him immediately.
If not,you’re able to brew one yourself. Thankfully, bothChamomileandSageareavailable for purchase at the Grocerin the center of the town.
With both items in hand, make your way tothe alchemy bench north of the village, where you can brew the Chamomile Brew.
In order to brew Chamomile Brew, you need to:
Finally, all you have left to do isgo back to him,hand over the Chamomile Brew, and thenwait a day before checking backon him to see if the treatment worked.
The treatment will work, and you will find Peter not at home as he went to work.Mlada will be thankful, and thiswill complete the Primum Nil Nocere quest.
She will give you the Thunderstone as a reward for helping, which will allow you to complete the Thunderstone quest.