It could be very easily be made painfull tho.
I don't really know how epic levels work, but my cleric/contemplative/hierophant(5 levels of +2 to dc/oversome Sr)
btw the hierophant 5 lvls are future addons.
wisdom 30, very very attainable, gives + 10 to Dc
hierophant gives +10 to DC
thats a DC of 50.
Like was said a fighter lvl 40 has a base fort save of 31. With cload of res +5, great fort, and whatever else say 42. Hell even say 45
Thats still a VERY VERY VERY good chance of a fighter failing that save. mages, rogues or low fort saves and you are pretty much DEAD. I think it is a bit too powerfull for the hd range.
And yes you can raise the fighters saves easily, but you can also raise the clerics dc, with spell caster prodigy, focus on specific schools and such. Either way, that is my cleric in a campaign i play in now, and right now i usually destruction evrything to death. The DC is 26, but my character was not optomized for DC and it still is pretty deadly(no heirophant levels right now) Lvl 18 cleric.