In some (most) cases it means "behind a door".
This kind of screwed me up when I was in Elden Root. The compass kept saying "below", and I couldn't find any way to get any lower to where I was. Then I found a delve, and I thought I found it, but a bunch of kills of bad guys later, I realized that wasn't it either. Turns out, it was ABOVE, not below, and I had to get to the location by going through a door in the back of the area.
Really confusing.
In some (most) cases it means "behind a door".
There is a specific icon if they are behind a door. And above or below just means relative to where you are they are either above or below you, since the ESO terrain is not all level. Example: You are on a mountain, said quest is in the valley, it will say (below).
In some (most) cases it means "behind a door".
There is a specific icon if they are behind a door. And above or below just means relative to where you are they are either above or below you, since the ESO terrain is not all level. Example: You are on a mountain, said quest is in the valley, it will say (below).