[Xietor]

-> If you think that.. invest in getting GoH or the Chalice.. noone is stopping you

--> GoH can be dispelled, or you could cast it

--> Chalice could be wished for

I am aware of that. What you may not be aware of is that all races are not created equal with respect to getting the chalice or goh, or wishing. (and in every mp game i have played i have had 1 or the other at one point in the game).
But it does limit the choice of races I will play in mp.

It would help balance the races that get no astral magic, like say Ulm or Vanheim, to be competitive in the end game,
when they are facing races that can already wish every turn with their clams if the chalice and goh did not heal undead.

It is adding insult to injury that the s races can wish for the chalice, and pretty much exclude any race like Ulm from ever touching it. Add to it that the chalice/goh make the best endgame units much better, and it is a very great advantage.

Ko's idea of permanent insanity/afflictions for the undead is a good one. Equally good though is increasing the cost and making all of them come out with no afflictions.