How to Make Fever Tonic in Kingdom Come Deliverance 2

In Kingdom Come: Deliverance 2, Hans's main quest, "For Whom the Bell Tolls," requires crafting a Fever Tonic to help someone at Trosky Castle. Here's how to obtain the recipe and brew the tonic.

Locating the Fever Tonic Recipe:

The recipe is found within the Surgeon's Workshop in Trosky Castle. Access can be gained through stealth or diplomacy. To avoid sneaking, complete "For Whom the Bell Tolls" objectives up to delivering the horseshoe. Then, speak with Cook Fanka at the forge; offering to help with her locked chest grants access to the noble's kitchen. Convincing the ailing Chamberlain you can help (skill checks required) will provide access to the workshop. Alternatively, if skill checks fail, steal food, proceed to the other courtyard stairs, bribe the guard with the stolen food, and sneak to the workshop. The Surgeon's journal, containing the recipe, is on a bookshelf inside.

Brewing the Fever Tonic:

The necessary herbs are already at the surgeon's station. Follow these steps:

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

Additional herbs are available in the chest if needed.

Completing the Quest:

After brewing the Fever Tonic, deliver it to Thomas. If you gained the Chamberlain's trust by crafting a digestive potion, return with both potions. Otherwise, use the noble's kitchen to reach the chapel and find Thomas and Adele. Speak with Adele to finish the quest.