Darklight Tower is a fort located in The Elder Scrolls V: Skyrim.
The Darklight Tower is an old ruined watchtower which now is infested with Frostbite spiders and witches. The tower is located south-west of Riften, almost at the end of the map, and straight south of Goldenglow Estate.
This is also the tower where the follower, Illia, is located. Accepting her request for help, the quest Repentance will be started.
Darklight Chamber Key - (Hagraven) - In Hagraven Lair
There is a key-only closet; the key can be obtained from Illia's inventory.
There is a master-leveled chest in one of the rooms.
If the tower is difficult to find, open the world map; it is in the big lake near Riften. There are three bigger islands, forming a triangle. The tower is directly south of the lower-left island. One can also see it from Largashbur, the Orc stronghold in the Rift.
While a horse is helpful in climbing up to the back of the dungeon, that isn't recommended, as there is one door that can only be opened from the entrance side.
PC 360 PS3 It is possible to approach the top of Darklight Tower from the world map before ever discovering it as a location.
PC 360 PS3 In the courtyard outside of the entrance to the tower are a hag and a hagraven. These two are part of the quest's plot, however one may kill them on the spot. If they are killed, the story plot may begin to glitch. Throughout the tower, there will be no witches, hag, hagravens, or spiders until the balcony area, where two characters are standing as if talking, but will not be speaking. After these two witches, lower level spiders, skeevers, and other witches will have appeared behind the Dragonborn after traveling. Illia will appear when the Dragonborn has picked a target to engage, behaving as if the two had already met, and the quest had progressed. The quest markers will appear, as well as the quest log dispplaying the quest. Illia will exit the same way the Dragonborn entered.
PC 360 PS3 If the Dragonborn had killed Illia's mother, Illia will still talk to her as if she was alive, yet with no response from her, the quest cannot progress. Sitting in the wodden chair between two sharpened poles will initiate the dialog of her telling her mother that she must die. Illia will then walk back to the tower, though the quest marker hovers over where her mother was standing before being killed. If the Dragonborn catches up to Illia, she merely engages in passive conversation with no dialog options. The quest remains active, with no way to progress.
PC 360 PS3 Solution: Loading a previous save before the mother was killed will help
PC Solution: Using the console to enter commands progressing the quest may help.