In Therefore there are special items that you can use on yourself. One of them is the nocturnal lamp, which allows you to travel to another plane of existence, the ethereal plane, turning you into an ethereal being, a specter. In this plane, you can see and interact with ethereal things and beings that in the real plane are completely hidden.

Even though you can explore any scenery using the nocturnal lamp, you will get a hint when you really need it, by a dialogue, a text or a sound.