http://www.project1999.com/forums/sh...d.php?t=126844
The link above is still very relevant. Sessedrix's necro guide is also appropriate if you need a change of scenery -
http://wiki.project1999.com/Sesserdrix's_All_in_One_Necromancer_Strategy_Guide.
CoM and spectres are both great leveling spots in the 40s.