Finding the Royal Treasury Key in Kingdom Come: Deliverance 2's Oratores quest can be tricky. This guide provides a clear walkthrough.
The Oratores quest, a significant main quest, involves several steps. After discussions with Rosa and Zizka, you'll need Vavak's assistance with a theft. A crucial next step is acquiring the Royal Treasury Key.
Locate the key in the outhouse (toilet) in the backyard of Vavak's house. The map screenshot below shows the exact location.
Examine the toilet bowl; an "Investigate" prompt will appear. Clicking it will reveal the key. Remember, this will dirty Henry, so wash up afterward to avoid dialogue issues with other NPCs.
With the key in hand, continue the quest by speaking to Zizka and Rosa. You'll then explore the underground passages with Samuel. The quest is lengthy, so prepare for a considerable undertaking.
This completes the guide on obtaining the Royal Treasury Key. Consult The Escapist for additional Kingdom Come: Deliverance 2 tips and guides, including locations of other treasures and recommended perk choices.