not sure of intended:
in zesdrum, below the left ladder is a vertical room. going through the bottom left exit doesnt bring you to the room right next to it.
but you end up where you would go if you took the top left exit.
not sur if you wrongly linked the rooms there.
or if it's some unfinished stuff and you did this on purpose
hmmm… not sure what is the room you’re refering to. If you could provide a screenshot or the name of the room (“L” key displays the room name) maybe I could have a better understanding of your situation. What was the last item you got?
The beam is located in Environs, but might have to enter there from Zesdrum.