In the sinister cave, there are 3 teleporters (one high on a ledge, one mid level on a ledge and one on the ground) you need to go through and explore the areas they bring you to (two of which have generators that need to be disabled) before taking out Barnabus in the centre of the cavern.
I went through the bottom and middle teleporters and completed them. The third one, I got partially through but used the dragon stone to get out of really quickly, and now I find a locked door. Is this going to be a problem if I don't finish the upper level room?
