Ruined Castle Corridor, or simply Castle Corridor, is a music theme originally composed by Michiru Yamane for Castlevania: Aria of Sorrow. It is the background theme for the Castle Corridor, as well as the Clock Tower in Julius Mode. It is Soma Cruz's theme in both Castlevania: Aria of Sorrow and Castlevania: Harmony of Despair.
Although the track makes no appearance in Castlevania: Lament of Innocence, an arranged version named "The Cross of Fate" was featured in its official soundtrack because fans requested one for Aria of Sorrow, which was released a year later with themes from Castlevania: Dawn of Sorrow. It also reappears as part of the Castlevania soundtrack in Super Smash Bros. Ultimate, although renamed "Ruined Castle Gallery".