I am working on a martial character which happens to have a high Fortitude score and the Steadfast Determination feat (Player's Handbook II, p. 83):
Benefit: […] You do not automatically fail Fortitude saves on a roll of natural 1.
As a result, I am wondering if the Soulfire armor enchantment (from Book of Exalted Deeds, p. 112) is still useful for this character. For reminder:
Soulfire: This armor’s wearer is immune to all death spells, magical death effects, and energy drain, and any negative energy effects (such as from chill touch or inflict spells).
I do not remember reading about death/negative energy effects which do not allow a Fortitude save, and therefore I have the feeling Soulfire would be useless here, however I might very well be digging my own tomb...
... so, does Soulfire provide any benefits for such a character?
Note: the character will have a high Fortitude and Steadfast Determination, because it's a tough cookie, even if it may not be optimal.