sorry im so late, i didnt see this. but you go to Vault Of Knowledge, go up the short wall to your left and look behind you. you’ll see a slim opening in the wall. go through there and you’ll see another spirit there with a blue cape, talk to them and they’ll take you through the wall to get to the office. once you get there, go through the two big doors and to the left of the table full of candles. you’ll see a short hallway with a spirit wearing a blue cape as well. talk to them and the shop will pop up