The Daemon Primarch Magnus the Red commands many Daemon Princes - they are his mightiest warlords, serving as members of his Rehati and leading his Legion's cults in conflagrant wars against the Imperium. Though their new-found power is immense, there are still other beings whom the Daemon Princes call master. More esoteric changes may take form in a Daemon Prince as well - shadows that burn with darkest fire and warp all that they touch, or halos of light indescribable in colour that pierce the thin layer of sanity protecting a mortal's soul from the Daemon Prince's gaze. Some Daemon Princes grow great leathery wings with which they soar through the skies of battle others develop a trailing cape of undulating tendrils. Its very flesh shifts between translucency and absolute opaqueness, and curved horns and thorny gnarls sprout from the Daemon Prince's body. Its skin takes on colours more pleasing to the Changer of the Ways, growing intensely bright, terrifyingly dark, or taking on variegated hues in fluctuating configurations.

Their metamorphosis renders the Daemon Prince completely unrecognisable from the living creature it once was.