Molten Fortress

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

The spirits found here are generally characters found in castles or ones associated with fire and lava. Spirits are ordered by when they are encountered on the map, up until the boss.

Spirit				Battle parameters
No.	Image	Name	Series	Enemy Fighter(s)	Type	Power	Stage	Rules	Conditions	Music
62		Mechakoopa	Super Mario Series	•Tiny Bowser Team ×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 Series	•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 Series	•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 Series	•Greninja ×3 (60 HP)		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 Series	•Curry Charizard		13,900	Kalos Pokémon League (Blazing Chamber (Legendary) only)	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 Series	•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	Super Mario Series	•Inkling Team ×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		Groudon	Pokémon Series	•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		Aisya	ASH: Archaic Sealed Heat	•Lucina		2,500	Bridge of Eldin (hazards off)	•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 Series	•Robin •Giant Ridley		3,700	Unova Pokémon League (hazards off)	N/A	•Reinforcements will appear after an enemy is KO'd •The enemy is giant	Preparing to Advance

Boss spirit

No.	Image	Name	Type	Class	Slots	Base	Max	Base	Max	Base	Max	Ability	Series
1,097		Giga Bowser		★★	3	1655	6700	813	3289	692	2802	Fire Attack ↑	Super Smash Bros. Series

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.

Image	Name	Type	Power	Stage	Music
	Giga Bowser	Neutral	???	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 Bowser is required to free, as he is locked behind Giga Bowser. Peach is optional.

No.	Image	Name	Type	Power	Stage	Music
13		Peach	Grab	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 location
Snack	Snacks (L) ×2	Next to Lyon's spirit location

Names in other languages

Language	Name	Meaning
Japanese	溶岩城	Lava Castle
English	Molten Fortress	—
French	Forteresse de lave	Lava Fortress