Abilities: Special, Extraordinary, Spell Like, Supernatural, Natural, get 'em here.

[Arcanist]

Bardic Music is yet another of those unlabeled abilities like Sneak Attack and Spells, but unlike those, each application has a tag fitting in Ex, Su, or Sp (I don't think there are any Ex Bardic Musics, but I may be wrong). And it does indeed look like Bardic Knowledge is either a Natural Ability, if we agree that not being listed as Ex, Su, or Sp means Natural, or simply unlabeled, if we're going by RAW.

Well this also applies to the Monk's Unarmed Strike and Perfect Self. I can understand the argument for the Monk's Unarmed Strike being an Ex (no support for such an argument), and Perfect Self being Su (again, no support for such an argument), but what specifically defaults them as such? Is it just our interpretation of how we believe it should be or is their any RAW basis for these cases? I sincerely doubt there is any WoTC created stat-block of a Monk 20 so we won't really know. Ultimately this falls down to the point where if the unlabeled Spells class feature is a Natural Ability then every other unlabeled class feature are also a Natural Ability (or default to their nearest RAI state)... Or would this be an improper assumption?

Something I can just DM fiat away, but won't!

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I suppose I should state why I'm asking. I want to do a Heroes game and if all of these class features are Natural abilities I can totally just call it off as that