This is missable. Do this immediately upon returning from the Deep Roads Expedition at the start of Act II because it will be unaccessible later on. If you you spared Idunnas life during the "Enemies Among Us" quest, you will find the letter at the Writing Desk in your estate. If Idunna died, you must interact with the evil tome at the Chantry or Viscount Keep to start the quest. You must find a total of 5 evil tomes (2 in Kirkwall and 3 in the Free Marches), unless you started the quest via the latter option, then you only need to find four.

Note: When you interact with each tome, you MUST choose the option to destroy it.

Evil Tome Locations

• 1. The Chantry - Upon entering, head up the left stairs and it will be on a table to the left.
  
• 2. Viscounts Keep - In the back of the Keep that was previously locked during Act I. Can be found on a bench to the left of the large square room.
  
• 3. Bone Pits - On the far east side of the Bone Pits, you will find an entrance to the "Cave".
  
• 4. Wounded Coast - The entrance to the Dank Cave can be found by taking the right (western) path upon entering Wounded Coast. You want to take your third Southern path (first two are dead ends) and you will see the entrance.
  
• 5. Sundermount - This tome can be found in the Abandoned Thaig, which can be accessed by travelling to Sundermount. Once there, head past the Dalish camp and take the left path and you will see the "Recently Opened Passage". Head inside and follow to quest marker.

After destroying all five evil tomes, travel to Darktown and enter the Evil Pit, which is located to the left immediately upon entering Darktown. Make sure you have a rogue with you as you will need one to unlock a door. You need to progress through the lair to find the Fell Grimoire. Finalize your party and prepare for battle. Interact with the Fell Grimoire and read it for two attribute points. You will now fight Xebenkeck and his minions. Emerge victorious for the achievement.

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