1. Excavation station
2. Bridge across the river
3. Two special buildings under the temple (watchtower + canyon bridge)
watchtower
canyon bridge
4. Gentaro Village Southern Shrine Bridge (Wrath of the Dragon God mission)
For the third material, please talk to the witch in the hut next to it to get it and it will be available for production at the same time (you will get 1 at the beginning of the mission, don’t lose it)
After reading this article about the materials required for all special buildings in the Warring Dynasty, have your doubts been lifted? If everything has been resolved, it will be worthwhile to consult a lot of information. If you still don't understand some parts, you can also ask questions in the comment area.