Aria of Sorrow. It connects the Castle Corridor with the Clock Tower and is the only place where the portal to the Chaotic Realm can be found.
While a boss doesn't appear within the area as you pass through it, a fight between Soma and Julius ensues there after the previously impassable black door can finally be accessed.
|Soma Cruz - Mina Hakuba - J./Julius Belmont - Yoko Belnades - Genya Arikado (Alucard) - Hammer|
|Creaking Skull - Manticore - Great Armor - Big Golem - Headhunter - Death - Legion - Balore - Chaos|
|Castle Corridor - Chapel - Study - Dance Hall - Inner Quarters - Floating Garden - Clock Tower|
Underground Reservoir - Underground Cemetery - The Arena - Top Floor - Forbidden Area - Chaotic Realm
|Castlevania: Aria of Sorrow & Castlevania: Dawn of Sorrow Original Soundtrack|
|Futabasha Official Guide - NTT Pub Official Guide|
|Bestiary - Inventory - Julius Mode - Voice Translations|