The relatively large forest known as Fangwood consists of a mixture of deciduous and evergreen trees, mostly various maples, firs, and spruces. In areas where the firs grow, close and tall, the Fangwood takes on a shadowy primeval feel that chokes the air and sends many skittish creatures into noise-induced panics. As the fir groves give way to sparser mixes of spruces and relatively rare pines, the underbrush thickens even as the feeling of oppressive dread slackens. Most Nirmathi who live in the forest dwell in these moderate belts between the firs and maples. These spruce and fir belts give way to uncommon alders, and from those to copses of maples, often surrounding clearings or lining streams. Underbrush chokes the ground beneath the maples, but the maple groves feel safe and welcoming.
For a land utterly dependent upon the forest for its livelihood, its economy, its safety (as the retreat for its soldiers), and even its very identity, a threat to the forest itself strikes at the very soul of Nirmathas. In the depths of the Fangwood, a strange blight has begun to grow and spread, the trees blackening, rotting, and spreading seeds of death. The deadly arbor mortis are the spirit-homes of blightspawned fey, the accursed offspring of the corrupted dryad Arlantia. The blightspawned fey in turn spread through capturing unwary humans and binding them in the moldering vines of the arbor mortis, turning those unfortunate victims into shambling heaps of moldering rot. Whether the curse upon the trees produces these thorn-crowned naiads or whether the trees are blighted by their touch, these symbiotes represent an insidious and deadly threat to the Fangwood.
Sources: Pathfinder Chronicles Campaign Setting