Iksars should never have been allowed to be Necros. Regen is too powerful. Makes the other Necro races obsolete for the most part.
Although interestingly there is one exception: if you were making a Necro on a Kunark-era PvP server, you'd be better off with an Erudite. Iksar low INT is a huge liability when you're forced to wear resist gear, and regen isn't a factor in most PvP fights because they tend to be decided quickly one way or the other. Better to have significantly more mana to lifetap/nuke with rather than regen in that case.
See the Erudite with 500+ more mana wearing nearly-identical gear:
https://wiki.project1999.com/Magelo_Blue:Erudmancer
https://wiki.project1999.com/Magelo_Blue:Iksarmancer