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 a lengthy process. After discussions with Rosa and Zizka, you'll need Vavak's assistance with a theft, leading to the task of retrieving the Royal Treasury Key.
Locate the key within the outhouse (toilet) in Vavak's backyard. The map below shows the precise location.

Examine the toilet bowl; an "Investigate" prompt will appear. Clicking it will reveal the key. Note: this will dirty Henry, so wash up afterwards to avoid dialogue issues with NPCs.

With the key, continue the quest by speaking to Zizka and Rosa, then explore the underground passages with Samuel. The quest continues significantly beyond this point.
This concludes the guide to obtaining the Royal Treasury Key. Check out The Escapist for additional Kingdom Come: Deliverance 2 tips, including Lower Semine woodcutters' treasure locations and optimal perk selections.
