Demons exist for one reason—to destroy. Where their more lawful counterparts, the devils of Hell, seek to twist mortal minds and values to remake and reshape them into reflections of their own evil, demons seek only to maim, ruin, and feed. They recruit mortal life only if such cohorts speed along the eventual destruction of hope and goodness. Death is, in some ways, their enemy—for a mortal who dies can often escape a demon's depredations and flee to his just reward in the afterlife. It is the prolonging of mortal pain and suffering that fuels a demon's lusts and desires, for it is partially from mortal sin and cruelty that these monstrous fiends were born.
Among the demon hordes, a succubus can often rise to incredible heights of power through her manipulations and sensual charms, and many a demonic war has raged due to the subtle machinations of such creatures. A succubus is formed from the souls of particularly lustful and rapacious evil mortals.