Cadatons
Modern necromancers make these by taking 3D printer feedstock that’s been premixed with gravedust and powdered human bone, then printing out a complete humanoid skeleton that is about the size and weight of an empty 17 ounce plastic soda bottle. Why? Because that’s light enough — and specially treated enough — to allow your standard disembodied spirit to inhabit one indefinitely. Assuming that the joints and whatnot were printed and put together properly, the Cadaton can even move — very, very slowly — under its own power.