Among Faithful nomads it is not uncommon for them to face east as the sun sets. Various myths record that as Shamash sinks, so Iblis strikes, trying to draw the evil out of a man’s soul so that he might unleash it back into the world as one of his servants.
Iblis strikes in the moments during sunset because Shamash will witness the deed, but it will be many long hours before the sun god returns to the sky, giving him plentiful time to escape the sun god’s wrath. By watching one’s shadow from the time the sun hits the horizon until it disappears completely, one can prevent it being stolen and misused.
Shadow souls know only base evil emotions, and act purely on instinct. They most often try to hide by assuming the form of a person’s shadow, but they frequently make mistakes. As the Bedu say, beware a man with two shadows, for one belongs to Iblis.
Though they are capable of evil acts of their own volition, shadow souls can also possess mortals. This works as the puppet power, though it is not actually a spell. When the shadow soul takes a host body, it becomes part of their physical form, and cannot be attacked. Banish forces the shadow out, but dispel and negated arcana have no effect.