No other option

 Just like Elius mentioned, a merchant and some workers appeared next, bringing food and other things the Northern base would use. They also brought some letters to the soldiers stationed there. After the man finished his business in delivering the letters, Zaos approached him.

"Hello, my name is Zaos and I would like to send some letters to the capital," Zaos said. "How much do I need to pay?"

 The merchant had short black hair and a round body. Although he comes pretty often to the base, it looked like that wasn't enough exercise since he liked to eat and drink fairly well.

"You have good manners and actually can afford to send some letters to your home… you must be from some famous noble house," The man said while studying Zaos from head to toe. "I am the merchant Wyn, the travel back to the capital is pretty long, so one silver coin will be required for each letter."