Lore of the Cobalts and Obsidian

The origins of the Cobalts
You see the cobalts are actually a very new faction. They came from some strange kingdom called Arandor where invaders, thought to possibly be the Viridians or possibly Ogres destroyed them. Fortunately some survived and fled to The Overworld where they hid to build up their forces. They colored their armor blue as a way of remembering their old kingdom. When the Viridians and other factions least expected they charged into the "War of the Clans" and crushed most of the resistance until their surprise attack was over. To this day they still build up their forces waiting for their next time to strike.

The Legacy of the Obsidians
The Obsidians are one of the oldest clans made from many raiding groups joining together to become a fearsome fighting force. Brutalized by the Templars and the Cobalts they formed a temporary alliance with both the Viridians and the Dark Knights. Fortunately for them this last-ditch effort was able to save them from destruction. Afterwards the alliance was quickly broken off by multiple sides. The Obsidians are also sworn enemies with the giants the only known reason may be is that their first and last king was murdered by a powerful force of giants. They're currently fighting a losing battle against nature to keep their outposts safe. Only time will tell if the obsidians stay as a clan or become destroyed by the forces of the knights.