Trying to complete the Hogwarts Legacy Cache in the Castle quest? Just outside of Professor Fig's classroom in the Astronomy Tower, you will find Arthur Plummly, a Hufflepuff student seeking treasure hidden within the castle walls. This side quest may not be much on the surface, but it teaches you a valuable lesson when exploring the school halls: nothing is as it seems.
To complete the Hogwarts Legacy Cache in the Castle quest and find the hidden treasure, you will need access to one of the most basic Floo Flames for fast travel if you lose your bearings.
How to find the Hogwarts Legacy Cache in the Castle
After getting the quest from Arthur Plummly, you need to turn around and head downstairs to find the first location. On the left side, you'll see a rhinoceros skeleton as you reach the bottom.
Coincidentally, if you've already completed the Hogwarts Legacy field guide page.
After reaching the skeleton rhino, head outside into the Transfiguration Courtyard, and you'll see a statue in the middle. This is the Wyvern Fountain, the second and another Revelio page location.
The third location on Arthur's map isn't far away. Head through the double doors into the North Hall and head upstairs, picking up the Daedalian key along the way. About halfway up the staircase, there is a suspicious painting of a house covered in snow. Cast Accio on the handle above it to drag the image closer to you, revealing a doorway. Inside you'll find a chest containing an Authentic Historian's Uniform.
Return to Arthur to complete this quest. He found some Galleons on his treasure hunt, much better than your useless robes, but you'll earn some gear for your troubles.
That's all you need to do to complete the Hogwarts Legacy Cache in the Castle. Similar to the best PC games for a wholly different adventure.
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