The demon realm is in the same exact place, occuring directly on top of you. You're just "invisible" basically (though mage invis/invis pots don't let you see it) _________________ The danger must be growing, for the rowers keep on rowing!
I don't think they are exactly the same place... you don't get totems/auras/shouts/whatever if you are on the "other realm" respect to the buffer, so i'd assume they are probably on different Z axis, at around 50 yd distance. _________________
Altho i'm not either sure that "invisible" people get auras from visible ones, i'll check from some mage next time if he gets my aura. If he doesn't while invisible it's definitively exactly same spot. _________________
Just add a buff / debuff that you can only see the NPC / players / misc with the same buff / debuff, change the color of the shield around the place and there you go.