"Bies: A demon of the Seven Angels of Sin. Found in the trees of the Forest of the Dead.

Creatory: Unknown how they are created. Creatures that are like the predators of the Good Forest, but with unquenchable bloodlust. Walks on two feet. 

DeadBird: A type of bird that only appears in the Forest of the Dead. Incredibly large, with a wingspan of fifteen feet, and sharp talons that can tear through metal.

Sorceress: A shapeshifter. Will lure prey in with a kind image, then  turn into their original shape of a mixture of a flying snake and a wolf. Impervious to iron but vulnerable to safesongs. 

Warlock: The male version of a yaga (see below). Less dangerous, but more versed in the arts of summoning and pathfinding than yagas. 

Wraith: A ghostlike spirit that haunts places of death. They can inhabit old corpses and often sing to lure their pray to their doom. Rare but powerful.

Yaga (or witch): The most dangerous of all creatures in the Forest of the Dead. Has powers in nature and wildlife and strong connection to the elements, particularly the earth. Is known for prowess in herbs. Can change pieces of their appearance, such as hair color, eye color, face shape, and height. Generally a worshipper of the Seven Angels of Sin. Can summon demons and enemies of the Ancestors."

--Taken from the Moracian Guide to the Forest of the Dead