The Underground Reservoir is a watery underground location in Castlevania: Aria of Sorrow. Most of the area can be accessible by gaining dominance over Skula's soul, Deep Seeker, which allows Soma to breathe and walk underwater. This stage is connected to the Castle Corridor, the Underground Cemetery, the Forbidden Area and the Arena.
Like in the Floating Garden, the Underground Reservoir doesn't contain a boss, although a Big Golem can be encountered here. Many of the enemies here are water-borne. This area is the also the only place where the Sky Fish can be found.
Behind the big waterfall located in this stage, lies the entrance to the Forbidden Area. The trick to access it, is to equip Undine's soul (to be able to walk on the water's surface), and then equip and activate either the Curly's, Manticore's or Devil's soul to dash through the waterfall. The player will receive the Eversing armor along the way and find the door leading to the Forbidden Area on the other side.
- Besides the Arena, the Underground Reservoir also connects to the Underground Cemetery. This last area is completely optional and not visiting it won't affect the game's continuity in any way.
- The Underground Reservoir also connects to the Forbidden Area, another optional location. It's advisable to visit this stage to obtain some very powerful items, like the Claimh Solais, one of the most powerful weapons in the game.
- Underground Cemetery - An optional stage connected to this area.
- Forbidden Area - Another optional stage connected to this area.
|Castlevania: Aria of Sorrow|
|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 - In-Game Formula - Julius Mode - Voice Translations|