Actually the focus effects will only increase your spell damage from a procedure if it is a spell you could normally cast. A necro with a http://www.allakhazam.com/db/item.html?item=23152 would not get focus Improved damage 4 where as a wizard would. I don't know if that's a bug or not but that's how it works.
Edited, Fri May 14 04:30:23 2004