Does a dhampir's racial bonus against mind-affecting effects stack with the barbarian's bonus against enchantment effects gained at 14th level, or do they overlap?
The reason I ask is because it seems unclear to me. My reasoning is that whilst not all mind-affecting effects are enchantments, all enchantments are mind-affecting effects (or at least, I think that's the case).
Yes, they stack.
Not only are they different types (undead resistance is a racial bonus, and indomitable will is an untyped bonus), but indomitable will even states that it stacks with all other bonusses.
An don't forget the bonus to will saves when raging.
So a raging 14th level dhampir barbarian get the following bonusses:
Enchantment effects: +9 (+3+2+4)
Mind-effecting: +5 (+3+2)
All other will saves: +3
Thanks for the perspective, HaraldKlak.