It's worth noting there are a few very good HP items that iksars cannot wear. Iksars also can't wear golden efreeti armor if that's up your alley. Also, while hp regeneration is a big boon to an iksar necro, it's not like they're casting more powerful spells.
DE necros can also do this quest
http://wiki.project1999.com/Reaper_of_the_Dead
Iksar cannot, at least not without insane faction work