Mercury: Bone Head in Catacomb.
Venus: Slime in Catacomb, Abyss Corridor (hidden room), and Audience Room.
Jupiter: Heat Shade in Machine Tower.
Mars: Bloody Sword in Chapel Tower.
Diana: Man Eater in Underground Gallery.
Apollo: Arch Demon in Underground Storage.
Neptune: Ice Armor in Underground Waterway.
Saturn: Fallen Angel near the Battle Arena.
Uranus: Scary Candle in Golem Boss Room (defeat Camilla first).
Pluto: Trick Candle in Cerebus Boss Room (defeat Camilla first).