Lost Valley Redoubt has the wall which has the word of power on it outside. There are Hagraven that hang around the place together with some forsworn who are doing some kind of ritaul with them. It is fairly easy to kill all the people there, just be careful of the Hagraven because they are fairly powerful magicians. You can find Lost Valley Redoubt here:
If you approach this location from the side you don’t have to deal with the forsworn at the bottom of the area. They aren’t difficult to deal with, but it certainly would cut a whole lot of time from this quest. Also the Hagraven and the forsworn don’t expect you to come from there so you get to catch them off guard.