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This article is about the Subspace boss. For the Australian smasher, see Smasher:Duon.
A boss in Brawl
Universe Super Smash Bros.

Duon (デュオン, Duon) is the sixth boss encountered in The Subspace Emissary. He doesn't hail from any particular series, and is unique to Super Smash Bros. Brawl.

His name is derived from the Latin word duo, a word meaning twosome, or a group of two, alluding to his two-faced design.

Boss description[edit]

Duon is a two-sided robot on one set of wheels; one half is pink and has a head cannon and two arm cannons, and the other half is blue with two arm swords and a curved blade on his head. Both sides have shoulder exhaust pipes which rockets (pink side) or mines (blue side) can be fired from (though these can also be fired from the arm cannons). He rotates 180 degrees to change his attack strategy. The wheels he pivots on are the Yin and Yang symbols from Chinese belief, symbolizing balance and juxtaposition of two forces. There is an invisible platform between Duon's two halves, making Duon one of only two bosses that a character can actually stand on, the other being Porky Minch.

Role in The Subspace Emissary[edit]

After Snake, Lucario, and Meta Knight kick all the Mr. Game & Watches out of the Halberd's control room, they fall to the bridge and dissolve into Shadow Bugs, which form into Duon, a last resort to defend the Halberd. He is confronted by Snake, Lucario, Fox, Zelda/Sheik, Peach, and Falco (Meta Knight stays behind to retake his ship and does not take part in the fight). The boss battle makes up the entirety of the Battleship Halberd Bridge level. After Duon is defeated, he dissolves into Shadow Bugs and leaves a trophy behind of Mr. Game & Watch.

Duon later reappears in The Great Maze and is refought by the playable characters.


Like all bosses Duon is controllable with hacks in Boss Battles Mode. The start button self-destructs any boss.

Move Input Description Side
Head Sword Chop A Duon bashes its head forward. Blue
Jump Crash A^ Duon jumps up high and crashes down, then grinds in place (prevents close-range attacks). The jump goes farther across the field on higher difficulties, which, ironically, makes it easier to avoid on higher difficulties. Both
Spin Av Duon spins around. Vacuums (And pushes down if below edge, effectively negating many non-tether-based recoveries) Both
Sword Blast A< or A> Duon readies its arms, then slashes making a large red shockwave. Very powerful. Blue
Mines B Duon launches several mines in the air. These can be detonated (won't hurt Duon) with vertical-based attacks, such as Pikachu's Thunder or a chucked item. Always followed by a "shared attack". Blue
Homing Missiles B^ Duon moves its non-weapon arm back to shoot four homing missiles. The missiles can be directed to hit itself. Can be detonated with vertical-ranged attacks or thrown items. Deals damage to Duon if the explosion hits it (Will also detonate on contact with Duon). Always followed by a "shared attack". Pink
Blue Bolts Bv Duon's head glows, and then shoots three blue bolts that will pierce though everything (including the field and Duon, but it doesn't hurt himself) except Pit's Mirror Shield. At higher difficulties, it will break shields, so dodging is far preferable. Cannot be reflected or absorbed. Pink
Vertical Pink Shots B< Duon shoots pink lasers with a vertical-spread coverage. Can be reflected or absorbed. It will aim higher and a little back if above or behind Duon. Pink
Ground Pink Shots B> Duon shoots pink lasers at the ground in the front. These lasers can be reflected or absorbed. Pink
Charge L or R Duon charges forward quickly. Wheels do damage while tilted after dash. Might be used several times in a row with little pause in between. Both
Spin Unusable Duon turns around, switching active sides and dealing damage. Used after Mines or Missiles. Both
Triple slash Unusable Duon slowly approaches, and then slashes three times when within range. He will turn around before slashing if the character jumps over him. Blue

HP and damage taken[edit]

HP Values Lowest difficulty Below-middle difficulty Middle difficulty Above-middle difficulty Highest difficulty
Battleship Halberd Bridge 339 375 402 447 492
The Great Maze 267.5 297.5 320 357.5 395
Round 1-3 4-6 7-9 1-3 4-6 7-9 1-3 4-6 7-9 1-3 4-6 7-9 1-3 4-6 7-9
Boss Battles 149.8 157.4 164.6 161 170 180 173 183.5 196.5 185 197 213 217 233 257
  EffectIcon(Normal).png EffectIcon(Slash).png EffectIcon(Electric).png EffectIcon(Freezing).png EffectIcon(Flame).png EffectIcon(Grass).png EffectIcon(Water).png EffectIcon(Darkness).png EffectIcon(Aura).png Specials: Direct Specials: Indirect
Damage taken ×1.0 ×0.7 ×1.0 ×1.0 ×1.0 ×0.7 ×1.3 ×1.0 ×1.0 ×1.0 ×0.75

Like all bosses in Brawl, Duon gains an additional ×0.6 damage resistance modifier when fought in co-op mode, effectively gaining 67% more health. This modifier is applied whenever the second player is in-game, and is no longer applied if the second player loses all their stocks.


Duon's trophy is obtained by using a Trophy Stand on it during the boss fight.

The Duon trophy in Brawl.
A robot with two upper bodies sharing one set of wheels. The blue-bodied half uses sword attacks, while the pink one uses lasers from his head and arms for offensive power. Whichever side is facing you will attack. Duon also threatens with homing missiles and the blade on top of the blue half.
Wii: Super Smash Bros. Brawl


No. Image Name Type Class Slot Ability Series
Duon spirit.png
★★ 2 No Effect Super Smash Bros. Series

Moveset gallery[edit]


  • Duon is the only boss that can hurt himself without the aid of items or a reflector.
  • Sonic's Homing Attack will always home in on Duon's pink side.
  • The word "DUON" is hidden on his wheels. This can be more closely seen when examined as a trophy.
  • Duon shares a resemblance to bosses from other series represented in Smash.
    • The missiles that are fired out can be redirected to hit Duon, similar to Dr. Eggman's robot in The Doomsday Zone in Sonic the Hedgehog 3 & Knuckles.
    • Even though the color is different, the shockwaves that Duon fires out are similar to Dark Meta Knight's shockwave attacks in Kirby & The Amazing Mirror.