Arx Fatalis: Tip (How to make money easily)

Needs Stealth 50.
Maria (a merchant in the city) has a potion of invisibility, we buy, go to the merchant of stones and rings, drink the potion, steal keys from him, go to his shop (if he comes back in the shop when he is at home), open the shop, open the chests, we throw out the contents on the floor, close everything and leave, then when he opens the shop we sell him everything that was thrown out. When we open the store we look so that the guard does not notice us, otherwise everyone in Aks will be enemies.