[thejeff]

One amusing use for immortal death mages is to spam lammashtas. Sure they kill you eventually, but who cares? You're immortal.

Battlefield flight range is unlimited, but probably similar to the moral check for passing more forward groups that ground troops on attack rear get, sometimes you get distracted and attack a closer target. Anecdotal evidence suggests that starting farther forward helps.

Higher research, but soul vortex is good?

How about dom 9/10 for awe? Will also help spread dominion, always good for immortals.

With other immortal death mages, mostly liches, I've found skelespam is as good as anything at taking most indies.