It is not clear what these things are. Union science has yet to encounter, capture or examine a specimen.
The only encounter so far was described by Erica Olafson , underneath the surface of N'Ger and the Necro Town there.
It appears that these creatures are semi-organic helpers able to perform complex medical procedures, such as transplanting brains and conduct cell restoration.
About a dozen of these medicine ball sized creatures came to the Necro King;s aid, but were immediately burned to ashes by "Black Flames "
It is not clear if these creatures are sentient or remote controlled.