So i'm following Iorveth through the loc muine ruins, and shortly after fighting the gargoyles you can either follow him, or descend into a nice cave with 4 lit up signs all over the place and you have to extinguish them in a proper order to open the chest in the middle
and you get NO EFFING CLUES other than
The doe's long shadow
the moon is waning
and it's autumn already
and you have to guess which random effing sign represents what
Easier way is to stand at the entrance to the room, then extinguish symbols to the left then right of the entrance. After that go for the upper right symbol that looks like 4, after that extinguish the last one and the chest is open.