The western forest, Sorix Melar marks the boundary between Twaan territory and the open Westwilds. The trees here are younger, the canopy thinner, and the Twaan clans more aggressive. This is the front line—where raiders, traders, and the merely curious first encounter Twaan hospitality.
Which is to say, they encounter arrows and warnings.
The Twaan of Sorix Melar have developed a reputation for shooting first. They maintain watch-posts in the larger trees, and they've learned to identify the difference between a lost traveler (escort out), a merchant (tolerate briefly), and a scout (kill immediately). Their paranoia is earned; they've repelled orc war-parties, human settlers, and at least one organized attempt to harvest timber from "unclaimed" forest.
The clans here are poorer than their cousins in Turxis Golathi, more fractious, and more desperate. They control the western trade routes into Twaan territory, which means they also bear the brunt of outside contact. It's made them hard.