Demagol was a Zeltron Mandalorian mad scientist... sounds like he was probably multi-classed. He became fascinated with Jedi and the Force, but since he didn't have any Force powers himself (the poor dope) he decided to investigate the Force scientifically, and we all know how well that usually works out. He stole Arca Jeth's Jedi robes, took genetic samples, and started fooling around with them in the laboratory. That means... *sigh* midi-chlorians. His plan was to create a bad-ass team of Mandalorian Force Knights. The experiments failed, mostly... except they seemed to create some Force sensitivity in a girl named Jarael, who would later grow up to have enormous breasts.