From PoxNora Faction Profile:
The Sundered Lands were the result of an enormous Nora Bomb that devastated the Old City of Valdec, and mutated the dwarves and humans that inhabited that ancient city. Now Draksar and Skeezick, these reptilian creatures seek revenge on the Protectorate factions.
The Sundered Lands units, with their dragon-scale plating and regeneration, are some of the toughest units in the game. If you enjoy playing dragons, reptiles and unstoppable tank units, The Sundered Lands may be the faction for you.
Split Faction: Champions you control take 10% less damage (after DEF), with a minimum reduction of 1, from attacks.
Full Faction: Champions you control take 20% less damage (after DEF), with a minimum reduction of 1, from attacks.