The Brittle King is one of Castlevania: Belmont's Curse bosses that you need to defeat to unlock their Arcana, Stained Glass Shield spell. You can find Arthur after defeating The Shadow boss in Notre-Dame, which offers access to the Chapel where Arthur's sword is located. Equipping the Fist Talos is a must, which unlocks after defeating The Builder boss in the Clock Tower.
Beat the Temptress in Castlevania: Belmont's Curse to remove fog and finally reveal the Hall of Mirrors map.
The Brittle King is found in the Chapel of Notre-Dame and can be reached after:
After fulfilling the conditions, reach the Chapel in Notre-Dame, equip the Fist of Talos Arcana in Castlevania: Belmont's Curse, then pull the Excalibur to trigger The Brittle King boss fight. Defeat Arthur in the battle while avoiding the emitted light, then claim the Stained Glass Shield Arcana and Excalibur Legendary Sword in Castlevania: Belmont's Curse.
To unlock The Shadow boss door, you need to find all the three Melody Sheets of Notre-Dame in Castlevania: Belmont's Curse. The three Melody Sheets can be found at the following locations:
After collecting each Melody, make sure to go to the Giant Organ location and play them to unlock more Notre-Dame areas in Castlevania: Belmont's Curse.
Once all the Melodies are played, you need to move to the Choir room to defeat Death, The Shadow. It is located northwest of the Mirror of Life in Notre-Dame Undercroft. Defeat Death, then you can head to the Chapel for The Brittle King.
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