I just added a PDF with Spell Prerequisite Charts for Demonology and Deathly spells. Rather than creating a new thread just to announce this I figured I'd do a little thread Necromancy with the new knowledge I've gained.
While these charts are pretty simple, it gave me some real respect for Michelle Barrett who got drafted to create the Spell Prereq Charts for GURPS Magic. Anyway, links to my webpage and the PDF:
http://gurpsland.no-ip.org#DFPrereq
http://gurpsland.no-ip.org/pdf/DF09Prereq.pdf