Molten Fortress

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Link before the boss at the end of the Molten Fortress.

The Molten Fortress (溶岩城, Lava Castle) is a sub-world found in the Light Realm within Adventure Mode in Super Smash Bros. Ultimate. It is located in the north central region above the Cliffside Rapids, and unlike other sub-worlds in the Light Realm, it does not require a certain type of Spirit to reach it. It is themed after the castle stages within the Super Mario series, and as such, P-Switches and Pipes are required for use in order to progress to the boss, Giga Bowser. The area's background music is Castle / Boss Fortress - Super Mario World / SMB 3.

Spirits

Spirits are ordered by when they are encountered on the map, up until the boss.

Spirit				Battle parameters
No.	Image	Name	Universe	Enemy Fighter(s)	Type	Power	Stage	Rules	Conditions	Music
62		Mechakoopa	Mario	•Tiny Bowser (×4)		3,800	Mushroom Kingdom U (Slide Lift Tower)	N/A	•The enemy starts the battle with a Bob-omb	King Bowser - Super Mario Bros. 3
1,059		Juste Belmont	Castlevania	•Richter		4,200	The Great Cave Offensive (Battlefield form)	•Hazard: Lava Floor	•The floor is lava •The enemy has increased move speed	Awake
642		Leif (Fire Emblem)	Fire Emblem	•Roy		9,300	Castle Siege	N/A	•The enemy can unleash powerful critical hits at random •The enemy heals over time	Fire Emblem Theme
893		Shadow Man	Mega Man	•Greninja (×3)		3,500	Norfair (Battlefield form)	N/A	•The enemy's neutral special has increased power •Stamina battle •The enemy favors neutral specials	Shadow Man Stage
485		Ho-Oh	Pokémon	•Curry Charizard		13,900	Kalos Pokémon League	N/A	•Fire and explosion attacks aren't as effective against the enemy •The enemy breathes fire	Pokémon Gold / Pokémon Silver Medley
712		Twinbellows	Kid Icarus	•Giant Duck Hunt		4,100	Find Mii (Ω form)	•Curry-Filled	•The enemy breathes fire •The enemy is giant	Boss Fight 1 - Kid Icarus: Uprising
61		Kamek	Mario	•Inkling (×4)		3,300	Mushroom Kingdom U (Slide Lift Tower)	•Easy to Launch •Item: Star Rod	•All fighters are easy to launch after a little while •Reinforcements will appear after an enemy is KO'd •The enemy starts the battle with a Star Rod	Fortress Boss - Super Mario World
498	File:GroudonSpirit.png	Groudon	Pokémon	•Giant Bowser		4,700	Norfair (Battlefield form)	•Hazard: Lava Floor	•The floor is lava •The enemy is giant	Victory Road - Pokémon Ruby / Pokémon Sapphire
1,227	File:AISYA SPIRIT.PNG	Aisya	ASH: Archaic Sealed Heat	•Lucina		2,500	Bridge of Eldin	•Assist Trophy Enemies (Shovel Knight) •Bob-omb Festival	•Bob-ombs will rain from the sky after a little while •Hostile assist trophies will appear	Attack - Soma Bringer
656		Lyon	Fire Emblem	•Robin •Giant Ridley		3,700	Unova Pokémon League	N/A	•Reinforcements will appear after an enemy is KO'd •The enemy is giant (referring only to Ridley)	Preparing to Advance

Boss

The boss of this sub-world is Giga Bowser. Defeating him grants players the Giga Bowser spirit, the partial destruction of Galeem's shield depending on the other sub-worlds defeated, and Bowser as a playable character.

No.	Image	Name	Type	Power	Stage	Music
1,097		Giga Bowser	???	???	Final Destination	Giga Bowser

Captured Fighters

There are two fighters that can be freed within this sub-world. Both are from the Mario universe, and one is required to free, as it is locked behind the boss.

No.	Image	Name	Type	Power	Stage	Music
13		Peach		7,500	Mushroom Kingdom U	Fortress Boss - Super Mario World
14		Bowser	There is no fighter battle for Bowser, this fighter is obtained after defeating Giga Bowser

Chests

Two chests can be found in this sub-world.

Type	Item Name	Location
Music Track	Melty Monster	On the most-right path to Peach's battle
Snack	Snacks (L) ×2	Next to Lyon's spirit battle

Trivia

• Bowser is the only sub-world character required to be unlocked through a boss, in this case, Giga Bowser.
  • This applies to both the Light Realm and Dark Realm.