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
Ripper Spectre	3,500	3,800	1200	1-4× Platinum Coin (common) 1-2× Great Spirit Potion (uncommon) Two Handed Sword (uncommon) Terra Rod (uncommon) Silver Brooch (uncommon) Emerald Bangle (semi-rare) Twin Hooks (semi-rare) Springsprout Rod (semi-rare) Green Ectoplasm (semi-rare) Serpent Sword (rare) Coral Brooch (semi-rare) Hexagonal Ruby (rare) Assassin Dagger (rare) Spike Sword (very rare) Wyvern Fang (very rare) Stone Skin Amulet (very rare)
Arachnophobica	4,700	5,000	1100 (400 , 350 , 350 )	1-14× Platinum Coin (common) 1-3× Great Spirit Potion (common) Spider Fangs (uncommon) Essence of a Bad Dream (uncommon) Silver Amulet (uncommon) Sword Ring (uncommon) Mind Stone (semi-rare) Wand of Cosmic Energy (semi-rare) Energy Ring (semi-rare) Life Ring (semi-rare) Axe Ring (semi-rare) Magma Amulet (semi-rare) Orb (semi-rare) Power Ring (semi-rare) Elven Amulet (semi-rare) Underworld Rod (semi-rare) Death Ring (semi-rare) Collar of Red Plasma (semi-rare) Ring of Blue Plasma (semi-rare) Garlic Necklace (semi-rare) Sacred Tree Amulet (semi-rare) Ring of Healing (semi-rare) Platinum Amulet (semi-rare) Spider Silk (semi-rare) Strange Talisman (rare) Strange Symbol (rare) Necklace of the Deep (rare) Collar of Green Plasma (very rare) Stone Skin Amulet (very rare)