Molten Fortress

Spirits

 * Mechakoopa
 * Juste Belmont
 * Leif (Fire Emblem)
 * Shadow Man
 * Ho-Oh
 * Twinbellows
 * Kamek
 * Groudon
 * Aisya
 * Lyon

Captive Fighters

 * Peach
 * Bowser (Unlocked after defeating Giga Bowser)

Boss Fights

 * Giga Bowser (After defeated; Bowser is unlocked)