Found around 666.28, -994.58 in the large diamond shaped room to the East. (The Dreamslayer Room)
Fight 1
A quaking haunt
---Zone: House of Thule
---Start Time: 2016-12-15 3:16:12 AM
---Fight Length: 43s
---Total Attackers: 1
---Total HP: 373845
---My DPS: 8694
Fight 2
A quaking haunt
---Zone: House of Thule
---Start Time: 2016-12-15 3:34:33 AM
---Fight Length: 64s
---Total Attackers: 1
---Total HP: 475818
---My DPS: 7435
Respawn is approximately 15-18 minutes