A nondescript square building that has room for two guards that change shift every 8 hours.  There's a fireplace inside, food enough for a week and a large earthenware jug of water for cooking and drinking.
Guard Shack, Outside Tower
a knight, captain, or general that may oversee the guards.
guard
I am a guard who watches for things at night. I live in a castle. I do not enjoy speaking with people.
Hello, sir! It's certainly a slow night, isn't it?  Indeed it is. What bring's you here? I was looking for one of my fellow knights. We are supposed to switch shifts right about now. Well I oversee all the Guards an most of the knights as well. I have not seen this other person. That is strange, indeed. I wonder if they stepped outside to investigate a noise? Noise? Should I be concerned? It is probably nothing serious. All the knights are trained to immediately report a disturbance. I'm sure he will be back soon. Ok, I will keep my sword close to me in case something happens. Good idea, sir. I'll also get my bow prepped and quiver loaded if you need my support. Thank you. In the meantime, I shall prepare dinner. Would like some food? That sounds lovely, thank you for offering! What are you cooking tonight?  A nice pot boiled chicken and juicy steak.