Duon

Duon
A boss in	Brawl
Universe	Super Smash Bros.
Location	Battleship Halberd Bridge

Duon (デュオン, Duon) is the sixth boss encountered in Super Smash Bros. Brawl's Adventure Mode: The Subspace Emissary. It does not hail from any particular series and is unique to Super Smash Bros. Brawl. Duon was created from several Shadow Bugs that had gathered into a single powerful entity.

Duon's name is derived from the Latin word duo, a word meaning twosome or a group of two, alluding to its dual design.

In Super Smash Bros. Brawl

Role in The Subspace Emissary

When Snake, Lucario and Meta Knight attempt to dispose of all the false Mr. Game & Watches in the Halberd's control room, they fall onto the ship's deck and dissolve into Shadow Bugs, which form into Duon, a last resort to defend the Halberd. The monster is confronted by Snake, Lucario, Fox, Zelda/Sheik, Peach, and Falco, while Meta Knight stays behind to retake his ship. The boss battle makes up the entirety of the Battleship Halberd Bridge level. After Duon is defeated, it dissolves into Shadow Bugs and leaves behind the trophy of Mr. Game & Watch, who joins the group after Peach revives him.

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

Duon is a two-sided robot on a set of wheels that bear a representation of the yin and yang symbol on the faces; one half of the robot is pink and has a cannon atop that head and smaller cannons on its arms, and the other half is blue with a pair of blades for arms and a curved blade on its head. Duon rotates 180 degrees to switch between either side and change its attack strategy. Both sides have shoulder exhaust pipes which can fire missiles (pink side) or mines (blue side). There is an invisible platform between Duon's halves, making it one of only two bosses that a fighter can actually stand on, the other being Porky Minch.

In Duon's defeat animation, it starts leaking Shadow Bugs while it spins around and shrinks for a few seconds, after which Duon's halves collapse on the ground.

Moveset

Move names with a Japanese name listed afterwards are sourced from the official Brawl Japanese guidebook "大乱闘スマッシュブラザーズX ザ・コンプリートガイド".

Notes: The "d" below is a multiplier based on the difficulty value. Final damage is rounded down to the nearest whole number. Boss Battles halves the final damage, rounding down again. Move names not from the strategy guide are fan-made in the absence of an official source.

Name	Damage	Description	Side
Swap	2 + 0.4d	Duon will spin 180 degrees to change between its pink or blue side. Used after Bomb Drop, Homing Missile, or after one side has used two attacks. The wheels have a weak hitbox during this time and has decent knockback, enough to KO at 70%. Deals slash damage and 10% additional shield damage.	Both
Reposition	4 + 1.8d	Some attacks move Duon away from the edges of the stage, requiring it to move forwards or backwards to get back into position. During this time its wheels have a hitbox. Strangely the hitboxes are only active when the pink side of Duon is in control.	Both
Rush	12 + 2.0d (wheel) 10 + 1.3d (torso) 16 + 2.8d (arm) 3 + 1.0d (wheel skid)	Duon leans back, spins its wheels, then charges forward with one of its arms pointed forward. As it reaches the edge of the Halberd, it turns, skids, and stops. It might be used several times in a row with little pause in between, especially when Duon has low health. All hits deal primarily vertical knockback and can KO as low as 10% on Intense, though Duon's own collision may save the player. The wheel and torso deal 20% shield damage. The arm deals slash damage and 30% shield damage. The wheel during the skid deals 15% shield damage.	Both
Jump	18 + 2.6d (fall, main body) 12 + 1.0d (fall, sides) 16 + 1.5d (quake) 2 + 0.4d (brake)	Duon jumps up high and crashes down, progresses to the edge of the platform, then spins its wheels in place. The jump goes farther across the field on higher difficulties, which, ironically, makes it easier to avoid. If the player is hit by Duon in the fall, they will sustain enormous vertical knockback. If the player stands on Duon during this move, they will be inflicted vertical knockback with high KO power just before the jump lands. In some situations it is possible to be hit by both the body and side hitboxes at the same time. All of the falling hits deal 30% shield damage. The quake hitbox only affects grounded players and deals 40% shield damage. The wheel while braking deals 15% shield damage.	Both
Spin Attack (回転攻撃)	1 + 0.3d (multihits) 8 + 2.0d (end)	Duon spins around with a very strong vacuum effect (although the range is quite short). It is extremely difficult for the player to escape once they have been trapped by the spin. If all hits chain on Intense, the move will deal up to 84% damage in around three seconds. It also pushes down the character if they are below the ledge, effectively negating many non-tether-based recoveries and gimping many fighters. Also, if the player stands on Duon, they will always be sucked in by the attack, suffering the maximum damage and knockback. The multihits deal 3% shield damage while the final hit deals 20% shield damage.	Both
Bowing Swing	16 + 2.5d (swing) 20 + 2.9d (strike) 6 + 0.8d (quake)	Duon pulls its head back then swings it forward with immense knockback. The attack is strongest as it strikes the stage. It has 54 frames of startup but quickly covers a wide arc. The blade deals 40% shield damage while the quake deals 10% and only affects grounded players.	Blue
Slash (斬りつけ)	18 + 2.8d (sweep) 14 + 2.0d (shockwave, early/close) 8 + 1.5d (shockwave, mid) 8 + 1.3d (shockwave, late/far)	Duon crosses its arms then performs a sweeping attack that makes a large shockwave in front of it. The hit itself deals strong knockback. Damage is also very high, however the slash itself has a very low range. The red shockwave inflicts high knockback, but is not as strong. All hits deal flame damage and 30% shield damage, except for the early shockwave which deals 40% shield damage.	Blue
Triple Attack (３連攻撃)	5 + 1.1d (hit 1) 7 + 1.1d (hit 2) 9 + 1.4d (hit 3)	Duon slowly approaches and then slashes three times when within range. It will turn around before slashing if the character jumps over it. The first two hits have windboxes that may send the player upwards regardless of it they're hit. The last inflicts decent vertical knockback. This attack can be fast and very difficult to avoid. All hits deal slash damage. Hit 1 deals 15% shield damage, hit 2 deals 20% shield damage, and hit 3 deals 30% shield damage.	Blue
Bomb Drop (爆弾投下)	10 + 1.09d	Duon launches several mines in the air. These can be detonated (but will not harm Duon) with vertical-based attacks, such as Pikachu's Thunder or a chucked item. It is always followed by a "shared attack". The mines are quite difficult to avoid, despite being slow, but they are also one of Duon's weakest attacks, KOing at relatively high percentages (over 100% on the lower difficulties and around 75% on Intense). The higher the difficulty, the more mines are launched.	Blue
Homing Missile (誘導ミサイル)	14 + 2.5d (player) 10 + 0.18d (friendly fire)	Duon moves its non-weapon arm back to shoot four homing missiles. The missiles can be directed to hit Duon itself, inflicting very high damage. Although only one of the hitboxes is programmed to deal friendly fire, either one can damage Duon, sometimes both at the same time. On lower difficulties in Boss Battles, all four missiles redirected to Duon can nearly KO the boss. The missiles can be detonated with vertical-ranged attacks or thrown items. The missiles are very powerful with enough power to KO under 50% on Intense difficulty. The higher the difficulty, the longer the homing time is—below Normal the missiles do not have enough time to curve back towards Duon. It is always followed by a "shared attack".	Pink
Triple Beam (三連ビーム)	14 + 1.5d (orb) 18 + 2.2d (laser)	A dark, blue orb forms on Duon's head and then shoots three strong blue bolts that will pierce though everything (including the field and Duon, but they do not hurt itself) except Pit's Mirror Shield. The lasers have 30% shield damage, breaking shields at higher difficulties. They cannot be reflected or absorbed. Touching the blue sphere on Duon's head deals very high vertical knockback. The beams themselves are extremely powerful, being able to KO around 30%. The beams' high speed and piercing ability, as well as the unpredictable beginning, make this attack extremely dangerous.	Pink
Rapid Fire (連射)	8 + 1.8d	Duon shoots pink beams in one of two ways: a wide arc or towards the ground. In the former case it will aim from directly in front of itself up to just behind its head. In the latter case it fires directly in front of itself and slowly rises up to the point of being horizontal—can be hard to avoid with how long it covers the ground. The beams can be reflected or absorbed.The lasers can KO around 60%, deal flame damage, and deal 8% shield damage.	Pink

Moveset gallery

• 

  Duon starting with a combo of slashes.

• 

  Duon continuing this combo.

• 

  Duon finishing the combo with an upward slash.

• 

  Duon dashing across the stage.

• 

  Duon's spin attack.

• 

  Duon landing with a crash to conclude its jumping attack.

• 

  Duon firing a stream of energy blasts from its arm cannons.

• 

  Duon firing a more powerful energy blast from the cannon atop its pink side's head.

• 

  Duon firing a barrage of missiles.

• 

  Duon's blue side crashing onto the stage, using the blade on its head to strike its opponents.

• 

  Duon's sweeping attack.

• 

  Duon releasing mines.

HP and damage taken

HP Values
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

Damage taken	×1.0	×0.7	×1.0	×1.0	×1.0	×0.7	×1.3	×1.0	×1.0	×1.0	×0.75

Phase changes	Phase 2	Phase 3	Phase 1 set	Phase 2 set	Phase 3 set
Battleship Halberd Bridge	50%	20%	1	2	3
The Great Maze	55%	20%	1	3	4
Boss Battles (round 1-3)	30%	20%	1	1	2
Boss Battles (round 4-6)	35%	20%	1	2	3
Boss Battles (round 7-9)	40%	20%	1	3	4
Note: When HP% is checked it is rounded down, causing the phase changes to occur 1% sooner.

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 removed if the second player loses all their stocks.

Trophy

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

Duon's trophy in Brawl

Duon

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 its 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.

: Super Smash Bros. Brawl

In Super Smash Bros. Ultimate

Spirit

Duon appears in Super Smash Bros. Ultimate as an Advanced-class primary spirit.

In Adventure Mode: World of Light, Duon is presumably one of the countless spirits captured by Galeem during his takeover of the universe. Duon's spirit is located in the Base sub-dungeon of The Light Realm.

Duon's Spirit Battle uses a giant Ice Climbers puppet fighter starting off with a Super Scope, referencing Duon's dual sides and the pink side's built-in laser blasters, and is fought on the Halberd stage's ship deck layout. During the battle, Shooting Type items will appear, further referencing the shooting attacks.

No.	Image	Name	Type	Class	Slots	Base	Max	Base	Max	Base	Max	Ability	Series
1,099		Duon		★★	2	1711	6865	924	3707	787	3158	No Effect	Super Smash Bros. Series

Names in other languages

Language	Name
Japanese	デュオン, Duon
English	Duon
French	Duon
German	Duon
Spanish	Duon
Italian	Duon
Chinese	杜昂, Duon
Korean	듀온, Duon
Dutch	Duon
Russian	Дуон

Trivia

• Duon is the only boss that can hurt itself without the aid of items or a reflector.
• It is possible to stand on Duon, between the two heads, although this serves little practical application as Duon still has attacks that can hit the player in this position, while the space for the player to maneuver on is very limited.
• Sonic's Homing Attack will always home in on Duon's pink side.
• The word "DUON" is hidden on its wheels. This can be more closely seen when examined as a trophy or when using mods that remove the in-game camera limitations.
• If Duon is defeated while performing its Vacuum Spin attack, it will finish the attack before beginning its defeat animation. However the player cannot be KO'd in this state, as the blastzones cease to exist the instant Duon's health is fully depleted.