It's one of the three areas of the Haunted Nexus.

Part of The Dream Courts Quest takes place here.

Name	Exp	HP	Max. Damage	Loot
Gazer Spectre	4,200	4,500	1200	1-5× Platinum Coin (common) Small Diamond (uncommon) Brown Crystal Splinter (uncommon) Small Sapphire (uncommon) Red Gem (uncommon) Red Crystal Fragment (uncommon) Small Enchanted Ruby (uncommon) Yellow Gem (semi-rare) Golden Idol of Tukh (semi-rare) Wand of Draconia (semi-rare) Wand of Inferno (semi-rare) Red Ectoplasm (semi-rare) Magma Coat (semi-rare) Prismatic Quartz (semi-rare) Small Enchanted Emerald (semi-rare) Onyx Chip (semi-rare) Hexagonal Ruby (rare) Stone Skin Amulet (very rare)
Thanatursus	6,300	7,200	1100 (450 , 350 , 300 )	1-12× Platinum Coin (common) 1-3?× Meat (common) Ham (uncommon) 1-6× Essence of a Bad Dream (uncommon) Halberd (uncommon) Terra Boots (uncommon) Ultimate Health Potion (uncommon) Terra Hood (uncommon) 1-3× Great Spirit Potion (uncommon) Knight Axe (uncommon) Mino Shield (uncommon) Dark Shield (semi-rare) Wand of Cosmic Energy (semi-rare) Beastslayer Axe (semi-rare) Sickle (semi-rare) Black Shield (semi-rare) Warrior's Shield (semi-rare) Obsidian Lance (semi-rare) Bloody Pincers (semi-rare) Titan Axe (semi-rare) Wand of Defiance (semi-rare) Warrior's Axe (semi-rare)