Lost to the Ages - p. 1 | Mutual side missions TES V: Skyrim - Dawnguard Guide
Last update: 11 May 2016
In order to begin this mission, you need to read a book called The Aetherium Wars. It can be found in various places around Skyrim, but personally I'd recommend examining the one lying on one of the tables in Castle Volhikar or Fort Dawnguard.
Afterwards head to Arkngthamz, the dungeon mentioned in the book, found south-east of Markarth.
After getting to the big cave, the ghost of a woman named Katria will appear. Speak to her and accept her help to begin the next mission.
New primary objective: Reach the Summit
Start off by heading to the other side of the precipice, collecting a journal lying by the woman's body on your way.
The corridor leads to a room with another pipe. Go up it.
At the end of the tunnel you will see a moving gate
Head through it and hit the machines on the right to open another passage.
Head further towards a big open space. turn right and keep running forward.
A bit further you will reach a spot with a couple growing trees. Katria will tell you that it's where she has fallen down.
You will also learn that at the end of the fallen tree trunk you can find her bow, Zephyr. Pick it up, moving slowly along the trunk.
It's quite a good weapon, as it lets you shoot 30% faster than with other bows.