In the main quest "For Whom the Bell Tolls" in Kingdom Come: Deliverance 2, Hans requires your assistance once more, this time at Trosky Castle. Your mission involves using alchemy to save a life by brewing Fever Tonic. Here's a comprehensive guide on how to locate the recipe and brew this essential potion.

Kingdom Come Deliverance 2 Fever Tonic Recipe Location

To find the recipe for Fever Tonic, head to the Surgeon’s Workshop within Trosky’s Castle. You have two options to gain access:

1. Sneak into the Workshop: This method requires stealth and patience.
2. Persuade the Chamberlain: Offer to make a digestive potion for the chamberlain, who is suffering from stomach issues. Successfully passing the skill checks to convince him of your ability to help grants you access to the workshop.

If you prefer not to sneak, proceed with the quest objectives by delivering the horseshoe. After that, return to the forge and engage with Cook Fanka. By offering to help her with her locked chest, she will guide you to the noble’s kitchen. Upon entering, you'll find the chamberlain in distress. Mention his health and pass the skill checks to gain entry to the Surgeon’s Workshop. If you craft both a digestive potion and the fever tonic, the chamberlain will allow you to meet Thomas.

Should your skill checks fail, you'll need to steal some food and exit the kitchen. Head to the other side of the courtyard, up the stairs, and through the door on your right to reach another kitchen. Bribe the guard with the stolen food to clear the area. Then, sneak upstairs to the Surgeon’s Workshop, where you'll find the physician's journal on a bookshelf. Read it and use the station to brew your potions.

How to Brew Fever Tonic

The herbs required for the Fever Tonic are conveniently set up at the surgeon’s station. Follow these steps to brew the potion:

1. Pour wine into the cauldron.
2. Add 3 handfuls of Feverfew.
3. Lower the cauldron and boil for 2 turns of the sandglass.
4. Grind a handful of Elderberry Leaves with the mortar and pestle.
5. Add the ground Elderberry Leaves.
6. Add 2 handfuls of Ginger.
7. Grab a phial from the bottom left shelf of the station, under the wine.
8. Distill the tonic using the Still.

Don't worry if you don't succeed on your first attempt; there are ample herbs available, and more can be found in the chest within the room. Given your prior experience with potion-making, crafting the Fever Tonic should be manageable.

Once you've brewed the Fever Tonic, you need to reach Thomas. If you've earned the chamberlain's trust by crafting the digestive potion, return to him with both potions. Otherwise, use the noble’s kitchen to sneak up to the chapel where you'll find Thomas and his sister, Adele. Converse with Adele to complete the quest.

This guide should help you navigate the challenges of brewing Fever Tonic in Kingdom Come: Deliverance 2 and successfully complete the "For Whom the Bell Tolls" quest.