At fellglow keep, there is a cellar door and a normal door near it with magic effect over it, as I searched at google images, it seems to be a "magically sealed door".
The point is, no matter I open or close them, nothing happens and the effect wont wear off... nothing will explode either, nothing at all happens... Also, one npc has interacted with the normal door before (not with the cellar door) but I saw nothing happening either...
I wonder if my installation is broken or they are supposed to be like that in some way; On google I did not find much info... Is this a broken thing?