Dark Mech

DarkMech, known as Assassin Mecha (アサシンメカ) in Japan, is a virus in the Mega Man Battle Network series that resemble a robot with sword hands. They only appear in Mega Man Battle Network 6.

DarkMechs attack by shooting out a Thunder Ball (similar to the Billy viruses) that track MegaMan. If he is struck by the ball, the DarkMech will warp in front of MegaMan and slash him with a Wide Sword-style attack. Because DarkMechs have two attacks, they give the player two different opportunities to counter them and obtain Full Synchro status.

DarkMech
 DarkMechs are green machine-like viruses with swords for hands.

ElecMech
ElecMechs are red machine-like viruses with swords for hands.

DoomMech
DoomMechs are blue machine-like viruses with swords for hands.

DarkMechSP
DarkMechSPs are black machine-like viruses with swords for hands.

Rare DarkMech
RareDarkMechs are purple machine-like viruses with swords for hands.

Rare DarkMech2
RareDarkMech2s are dark green machine-like viruses with swords for hands.

Mega Man Battle Network 6
(Each variant's Thunder Ball attack deals 10HP of damage, while their Machine Sword attack varies as listed).

Battle Chips
Deleted DarkMechs yield the Machine Sword series of Battle Chips. These chips are non-elemental.

Machine Sword
MegaMan uses a wide sword style attack on every enemy that is paralyzed, inflicting 200 damage. Dropped by DarkMech.

Letter Codes are H, L, and Q.

Element Sword
MegaMan uses a wide sword style attack on every enemy that is standing on an elemental panel, inflicting 220 damage. Dropped by ElecMech and Rare DarkMech.

Letter Codes are J, M, and U.

Assassin Sword
MegaMan uses a wide sword style attack on every enemy that is either paralyzed or standing on an elemental panel, inflicting 240 damage. Dropped by DoomMech and Rare DarkMech2.

Letter Codes are N, R, and Y.