调查研究4

thumb|Tower of Nightmares achievement locations. Investigative Study 4 is a Tower of Nightmares achievement.

1. 1

   A Veiled Threat Looms Over Kessex (Kessex Hills)

   凯席斯危机四伏（凯席斯山）

   Open world Kessex Hills. On a barrel inside the tent at Thunder Ridge Camp.

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   A Veiled Threat Looms Over Kessex

   A Veiled Threat Looms Over KessexKessex HillsThunder Ridge Camp
2. 2

   Mysterious Fable Page (The Tower of Nightmares)

   神秘传说书页（噩梦之塔）

   In the Tower of Nightmares. First Level, laying on the root of a large tree.

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   Mysterious Fable Page

1. A Veiled Threat Looms Over Kessex (Kessex Hills)

2. Mysterious Fable Page (The Tower of Nightmares)

3. Mysterious Fable Page (The Tower of Nightmares)

4. Mysterious Fable Page (The Tower of Nightmares)

5. Nightmare Court Letter (The Tower of Nightmares)

6. Dolja's Research Notes (The Nightmare Incarnate)