Otherwise known as the Realm of Dreams, the Vaenar is a twisted shadow plane, filled with the tormented minds of those trapped within by the many fell creatures it has spawned. These include:
Draehir: A form of incorporeal undead. The Draehir are a friendly race, to most. The calming, peaceful thoughts that those in their domains have influenced the Vaenar to the point that their homes have become an idealized world, resembling a form of heaven. However, they should not be underestimated. They have the ability to channel these thoughts and dreams to create lethargy and apathy. (See the planet of Miranda in Serenity, but without the Reavers.)
Night-ghasts: Trapping living foes within nighmares, the territory of the Night-ghasts is a twisted, foul realm. They can channel the dreams of those they have trapped to inflict pain and terror.