Through the Prophet's Eye
Undead Doppelganger Construct
Undead Doppelganger Construct is probably the best description one can make for the creatures that work for Mr Jacobs. The things seem to start off as a few small Scarabs inside the bodies of a living host. There they begin to make copies of themselves. As they increase in number, they consume and assume the responsibilities of the hosts skeletal structure, and internal organs. When they have taken over enough of the host, they assume control, and seem to be able to call on the hosts full knowledge to maintain their secrecy.