Hall of Knowing (Duat)
A stelae location in the Duat realm. You might as well trigger the Shield or Blade side quest right outside before heading in- the quest goal and the stelae are in the same place.
Once inside, go to the locked door at the south end of the hall, and find it locked.
As usual, look up for a high window to parkour through.
Read the stelae in this room for a riddle piece and mission completion.