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
guard
otter
I am the otter that circles around the rivers and lakes. Sometimes I can be found around the castle moat. I am always looking for food that the villagers throw away.
Guess you should ask yourself since you are supposed to be a guard. Dont speak to me like that I am your supirior!  No, please don't hit me! I'm just a hungry otter, I don't mean any harm. I feela great sadness from within you, Would you like some food? Yes please kind sir. I see that there is enough food in this shack to feed you humans for a week. Surely you may spare an otter's share tonight. No you cant have any food, get out of here! You are so cruel! Why hug me and ask if I would like some food only to turn me away? Because you are an otter and I am human, I am supirior and can do whatever i want Wait, before we fight to the death, could you hold this piece of wood for a second? No I can Not! You humans are too smart! I was going to use that fireplace over there to set you and the wood on fire. But now it looks like I must retreat. Ill see you another time then!