Item description:

Go up to the other Door and interact with it to go through.

Before doing anything else, look for a red book on the left bookshelf
from the Door's left. You will see a book on it's left is interact-able
(it's on the very top shelf). ** View Screenscreent If Needed **

Interact with the book and it'll open a secret chamber to Kian's right.
Enter this hidden room and interact with the Painting in front of Kian.
(Portrait Of A Necromancer trophy will pop)



NOTE:

You can continue on with this save and get the Bad Boys trophy,
but I thought it would be better to have a seperate save for it