5. Final Step: Investigate the Letter and Complete the Quest
After defeating Vilnuus, the Hunter, complete the investigation of the Partially Burned Letter. This will trigger a cutscene and bring the quest to its conclusion.

6. Return to the Den
Once you've finished at the Abandoned Ruin, head back to the Den. Speak to Raheir, who will acknowledge your success and reward you with the Aldkin Mercenary.

Summary of Key Actions:
Defeat the ambush: Handle the demons that ambush you along the path toward the manor.
Explore Chusoh Manor: Interact with objects for lore or Diablo 4 Items head straight to the Abandoned Ruin.
Interact with objects: Investigate the key objects in the Abandoned Ruin, including the Partially Burned Letter.
Defeat Vilnuus: Take on Vilnuus, the Hunter, and his demon minions in the boss fight.
Return to Raheir: After completing the quest, speak to Raheir to unlock Aldkin as a Mercenary.
Conclusion
Completing this part of the "A Nameless Mystery" questline is essential for unlocking Aldkin, a powerful Shadow and Fire magic Mercenary in Diablo 4. After defeating the ambush, navigating the Chusoh Manor, and defeating Vilnuus, you’ll have unlocked a new ally to Diablo IV Items for sale help you in Nightmare Dungeons, Uber Bosses, and more.