Excalibur was safe in the stone near her crown. While I set up Avalon for a deep slumber, those safety measures would prevent anyone from stealing the crown or somehow the sword. One of those being a temporal labyrinth, masking certain rooms from entrance and altering the existing layout. Making the castle appear more maze-like. The throne, along with the crown and sword, will be hidden among the labyrinth. Making it impossible for anyone but Morgana from access it. Avalon will then be powered down, preserving itself and the important rooms.