Talk:Ainz Ooal Gown/@comment-78.55.164.56-20161007095046/@comment-71.241.156.130-20161108192929

Late reply, but Sbh1fr, that's not an analogy, that's simply reversing the situation, and that doesn't work. Undead are innately more limited than living (living can adapt, change, etc. but dead is dead, and undead are more a "false life" than truly living), so just because humans can use negative energy through proper research and spell-casting to "heal" undead, doesn't mean that undead should automatically be able to use holy healing (in 99% of media, be it games, TV, movies, etc. holy magic does bonus damage to undead, healing magic hurts them, etc.).

All that said, Shalltear is certainly an unusual case of undead due to her Cleric and Valkyrie levels. However, her build progresses from them to Cursed Knight (often this is used to be a "fall from divine grace" which would explain why she can't use divine magic). Her Sacred Lance is usable due to her Valkyrie-Lance class but in all likelihood the Cursed Knight prevents her from using any mid or high tier holy magic (she can use Regeneration, according to her abilities and powers page, but that's likely a Tier 1-3 spell, and IIRC Tier 5 is where "regular" resurrection is. It's likely she went Cleric -> Valkyrie (holy but focused toward physical fighting rather than healing, similar to Paladin or Templar) -> Blood Drinker (embracing her vampiric nature) -> Cursed Knight and the last two effectively negate any chance she'd have of using resurrection spells.

As for why Ainz probably can't use Resurrection spells, considering he built his character from a role-playing perspective, even with his OP ability that lets him learn spells from other classes, Resurrection (giving the dead TRUE life) directly conflicts with his necromancer-focused build, so even if he COULD have learned it in Yggdrasil, he likely would have chosen not to, instead adding all kinds of ways to deal more damage or debilitate enemies to augment his death-based magic.