apparently this item
http://wiki.project1999.com/Thin_Boned_Wand is supposed to drop from special vampire bats in erud's crossing that are lvl ~12 necromancers that have pets. A 2000 allakhazam comment confirms this:
http://everquest.allakhazam.com/db/item.html?item=3667
I don't believe these necro bats currently spawn on p99