The Liaj Jungle is the lair of the Great Dragon Usun. Usun considers the entire jungle to be his home and brooks no intruders into his domain. He also uses the jungle as a private nature perserve and hunting ground.
He is the most isolationist of the Great Dragon is Barsaive. He firmly believes that dragons should rule as they did in the past, and rankles at the way the other dragons manipulate events from behind the scenes. He is a fighter and hunter, with little taste for diplomacy. His jungle lair reflects this attitude, being home to some of the most ferocious beasts in Barsaive.
This is the Great Dragon that the party now finds themselves beholden to. He is allowing the people of the Kaer safe passage out of his jungle home. He is also allowing to use resources from the edge of the jungle to build a new home. He obviously wants something from the party and the people of the Kaer. For now his motives remain a mystery.