Double Soul (MMBN4)

Double Soul (ソウルユニゾン Soul Unison) is the main transformation system of Mega Man Battle Network 4, it can only be used by Good MegaMan.

How to Use

To Double Soul, the player must sacrifice the respective element chip to unite with MegaMan (the chip cannot be a Regular Chip). The transformation will last 3 turns or until it is overwritten by another Soul. MegaMan will lose the form when the Emotion Counter hits 0 and he’s in a position where the player can control him. There also are Mod Cards that will allow MegaMan to remain in a Soul permanently.

• Each Soul can only be used once per battle.
• Normally Souls cannot access Dark Chips, but during ToyRobo's ShadeMan fight, the mandatory DarkSword will show up and can be used. It can also used to Double Soul into Proto Soul and be charged up.

Soul Abilities

Red Sun

Guts Soul
Sacrifice	Crack chip
Power Attack	Guts Punch (60 AP) Non-flashing. Small Push, pushes 1 panel.
Abilities	All None and Crack chips gain +30 attack power (dimming and non-dimming). Guts Machine Gun: Rapidly pressing B (Press B 6 times within 1/6 of a second between each press) will make MegaMan temporarily invincible and execute a rapid fire attack. (10 AP, up to 5 times)
Fire Soul
Sacrifice	Fire chip
Power Attack	Flamethrower (50 AP) Fire attack.
Abilities	Fire Body: MegaMan can walk on Lava panels and is weak to Aqua attacks. Stepping on Lava Panel will have MegaMan consume it and heal 50 HP. Upon Unison, the stage is reset into one with plus-shaped Grass Panels. Charge Fire chip (dimming and non-dimming): The chip becomes a Fire Arm that travels down the whole row. (150 AP)
Roll Soul
Sacrifice	Recovery chip
Power Attack	Roll Arrow (30 AP) The struck target's BattleChips are destroyed.
Abilities	MegaMan heals 10% of his HP anytime he uses a BattleChip. Does not heal if it is used in a Screen Dimming Cut In.
Wind Soul
Sacrifice	Wind chip
Power Attack	Wind Racket (50 AP) Non-flashing. Big Push, pushes all the way down the row.
Abilities	B Button: MegaMan's normal buster becomes Air Shot (5 AP). Air Shoes: MegaMan can walk over Broken and Hole panels. Upon Unison, NorthWind takes effect. The enemy's Barrier or Aura are blown away. For 3 turns, a Fan effect is active on the enemy's field. The Fan effect can be overwritten by a Wind or Fan chip. If that obstacle is destroyed, there will be no Fan effect on the field. Wind chips gain +10 attack power (dimming and non-dimming).
Thunder Soul
Sacrifice	Elec chip
Power Attack	Zap Ring (20 AP) Elec attack. Paralyzes.
Abilities	Elec Body: MegaMan is weak to Wood attacks. All non-dimming None and Elec chips will paralyze. The paralyzation applies to all hits of a multi-hitting chip with the exception of ElemSand. Said chip will cause flashing regardless.
Search Soul
Sacrifice	Invisible chip
Power Attack	Scope Gun (10 AP, up to x5) Pierces invisible.
Abilities	Upon Unison, all invisible and underground enemies are no longer in that state. A Shuffle button appears on the Custom Screen that can shuffle unselected chips with the Folder. This can be used up to 3 times per turn.

Blue Moon

Aqua Soul
Sacrifice	Aqua chip
Power Attack	Bubbler (20 AP) Aqua attack. Charges very quickly.
Abilities	Aqua Body: MegaMan won't slip on Ice panels and is weak to Elec attacks. Charge non-dimming Aqua chip: x2 the chip's attack.
Number Soul
Sacrifice	Plus chip
Power Attack	Die Bomb (10 AP x Die Roll) If the Die hits the enemy directly, it will only have 10 AP.
Abilities	All None chips gain +10 attack power (dimming and non-dimming). The Custom Screen displays 10 chips to select from.
Wood Soul
Sacrifice	Wood chip
Power Attack	Twister (20 AP, up to x8) Wood attack. Non-flashing.
Abilities	Wood Body: MegaMan will rapidly heal on panels and is weak to Fire attacks. Status Guard: MegaMan can't be paralyzed, blinded, confused, or immobilized. If a selected non-dimming Wood chip is followed by a None Chip, the Wood chip consumes the None Chip and its attack power is added to it. One of strongest None chip target for Wood Soul's ability is BlueMoon. Through the Select Battle feature in Network, its attack power can be raised to 600.
Metal Soul
Sacrifice	Break chip
Power Attack	Metal Fist (150 AP) Breaking. Small Push, pushes 1 panel.
Abilities	Break Buster: The normal buster will have break property. Charge non-dimming None or Break Chip: 2x attack power.
Junk Soul
Sacrifice	Summon chip
Power Attack	Poltergeist (100 AP per obstacle) All obstacles thrown will be breaking.
Abilities	Upon Unison, all invisible and underground enemies are no longer in that state and all enemies gain confused status. Two recycled "Junk-Chips" appear in the Custom Screen every turn. These are chips you or your opponent have selected in previous turns (they didn't need to used in battle), these include Dark Chips.
Proto Soul
Sacrifice	Sword chip
Power Attack	Wide Sword (80 AP) Sword attribute. Non-flashing. Unlike most busters, this attack can counter hit.
Abilities	All non-dimming Sword attacks will not cause flashing. B + Left: Reflect. If an attack is blocked, 50 damage is sent down the row. Charge non-dimming Sword Chip: x2 the chip's attack and MegaMan warps 2 steps forward while using it. Z Saver and Slasher BattleChips can be charged for x2 attack power but MegaMan will not step forward. Unconventional Sword Chips will require more work. For VarSword and Z Saver commands, the A Button must be pressed down again after releasing it for the charge. For Slasher, the chip must be used instantly.

Glitches

• If 5 chips have already been selected in the Custom Screen but there are still selectable chips: When the Unison is done with the last chip, the grayed out visuals for selectable chips are colored in again.

Trivia

• Since selected but not used chip still appear in Junk Soul’s Junk-Chip mechanic; If Dark Chips are selected and not used, then MegaMan restores himself from the Worried emotion into Junk Soul, they will appear again through Junk Soul’s recycle. MegaMan can use those Dark Chips without the consequence of going Evil emotion or losing 1 HP permanently.
• Since MegaMan will only lose Double Soul once he regains control, if MegaMan is continuously paralyzed or stunned the turn he’s supposed to lose the form, he will carry the form to the next turn. All Custom Screen abilities will also remain.
• Since the Double Soul Mod Cards do not reset MegaMan’s Karma, he will be able to use Evil Chips in Double Soul forms.