This is the Chaggrin, an elemental grue from the Plane of Earth from the AD&D 
Monster Manual II.   It spent a long time without spines because I couldn't find the  appropriate material.  I found a rusty chimney brush in my parents'  basement and I knew the grue had found its spines.  It still has a vile  smell from the epoxy glue, perfect for a hedgehog-like entity with a  skeletal head.
 
 
 
 
The best part is that if you pick it up incorrectly, you might need a tetanus shot.
 
Illustration of the Chaggrin from the 
MMII.
