The Duke's Archives - p. 2 | Walkthrough Dark Souls Guide
Last update: 11 May 2016
Eliminate smaller enemies and then focus on mage.
An alternative way of clearing the chamber is to run behind the left or right bookcase. [1] From here you can lure out most of the bluish creatures. What's more there is even a chance that a mage will come to you. [2]
Clear the ground floor and collect a soul from under the stairs.
Once you walk on the stairs, be careful - there are an archer on the left and a warrior on the right. [1] Run around the floor, eliminating enemies. [2]
Take a look at the balcony.
There are chest on both sides of the inner balcony, but watch out! One of them is a monster (hit it before opening).
After collecting all items, use another elevator. [1] You'll get to the crystal room. [2]
Run the corridor to the right. You'll be attacked by a crystal enemy - he is quite easy to defeat, but only if you block his blows. [1] Run up the stairs. [2]
At the top you'll see fog leading to boss Seath the Scaleless. At the first time you can't win with him - you'll die for 100% (this is because of the game plot). If you have many souls and Humanity, you might put on Rare Ring of Sacrifice, so you won't lose them.
Go through fog.
Let Seath kill you - in these conditions he is indestructible.