So here is the situation : I want to make a really similar quest to the quest for Molag Bal. I want to make so when the player approaching
a far location in some points someone says some lines. And when the player reaches his destination a conversation is opened but you can't see with who are you talking. Like in Molag Bal. I don't think that is really hard to duplicate but I need help ! If someone can help me do that it will be great ! Thanks in advance !

The topic starting when approach part may have been done with a trigger box. And the unbodied voice I suppose they made using a talking activator activator. Both are objects you can find in the CK.

Actually it wasn't made with trigger. Or at least I think it wasn't made that way because when a loaded that location in the CK there was no trigger box. The voice was made by xMarker but I don't know how to make so when the player goes to a location a dialogue it opened.