DARK

DARK Monsters are mainly a Attribute that rivals LIGHT in a few ways, Telling from ZSlyther Mehods there will be a fetured Duel Monster War Battle,"Dark VS Light" but in planing plans to keep secret.

List of DARK Monsters on Wikia:

Dark Core

Darkos Attack

Darkos Carrier

Darkos Guard

Darkos Top

Machine Emperor Darkos Infinity

Yubel Kuriboh

Example: