Merlin immediately checked his quest information, and while immediately scrolling past the wall of text he was already familiar with, he saw a couple of extra lines added to the bottom.
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[Hidden Mythical Quest]
A door without a key.
Within Megalopolis stands several ruins from an ancient civilisation...
...
During a full moon, a strange spectral film seems to fill the space within the door frame, and for some unexplained reason, souls and anything related to them are unable to pass through the door frame, whether that be souls themselves or even soul-infused equipment.
It seems as though this door frame has some connection with the goddess Hecate and the spirit realm. Her name is clearly written on the stone frame in what you believe to be ancient Arcadian. What is the purpose of the door frame, and why is it blocked off?
Figure out a way of opening the mysterious door frame.