First “room” of a freshly disturbed barrow mound

A farmer approaches the party on the road. “There are no rooms in town, but I have space and a need. We can do a trade” the wheat field is shorn except for the back half. The farmer produces an ancient arrow and an injured son. If you approach the mound entrance from the front you will take arrow attacks. If you circle the mound you will notice a rough vertical column above the mound where the stars are clearer. https://i.imgur.com/T0pMwdD.jpg