Include Undead (FiD)

Starfox's Blades in the Dark fan page

Death creatures are undead of all sorts. Study can call apparition that can communicate but not act. Attune can call ghosts that scare and some poltergeist activities at and undead spirits can be called to inhabit corpses as zombies and skeletons. At mid to high tiers, spirits can be called to possess stronger things, such as an undead knight or a powerful mummy, or as incorporeal undead that can walk thru walls and are invulnerable to mundane weapons.