Darkness
Hand and Eye of Piratecat [Moderator]
The 3.0 FAQ has this:
Undead type description mentions only Concentration checks in 3.0, just like in 3.5.
If a barbarian became undead (by gaining the vampire
template, for example), how would you determine how long
his rage lasts? He no longer has a Constitution score. Could
an undead barbarian theoretically rage until all opponents
were defeated or someone takes him down? Or does his
rage simply last 3 rounds (base 3 + 0 for no Constitution
score)? Or do you assume that the undead barbarian has a
Constitution score of 4 (0 + 4 bonus from rage) and so
cannot rage at all, since the modifier for an ability score of
4 is –3? Does this Constitution “boost” have any other
effects on the undead barbarian? Does he actually lose hit
points?
An undead creature uses its Charisma modifier wherever its
Constitution modifier would normally apply (except Fortitude
saving throws, for which the creature must use its +0
Constitut ion modifier if it needs to make a Fortitude save at
all). Thus, the example barbarian rages for a number of rounds
equal to 3 + his Charisma modifier (but always for at least 1
round).
An undead creature has no Constitution score at all and
cannot gain one by receiving a bonus. Therefore, the +4
Constitution bonus from rage has no effect on this barbarian.
Undead type description mentions only Concentration checks in 3.0, just like in 3.5.