Death’s End: Some Pahmet come from long lines of guardians who train to defeat any undead that enter the tombs they protect. Dwarves with this racial trait gain a +2 bonus to AC against undead and a +2 bonus on saving throws against spells and spell-like abilities cast by undead.
This replaces defensive training and hatred.
Does the bonus to saving throws against spells and spell-like abilities from this stack with the Hardy trait which gives a +2 racial bonus to all spells and spell-like abilities? By the usual rules for stacking bonuses, they would because the Death's End bonus is untyped while the Hardy bonus is a racial bonus.
For reference:
Hardy: Dwarves receive a +2 racial bonus on saving throws against poison, spells, and spell-like abilities.
Death's End's bonuses seem to be untyped, so yes.
(And even then, "racial" is one of the few bonus type that'd stack with itself anyway)