Fragnarok's page

Disable Device is just an example, since it's one of the few skills that can't even be attempted without a single rank.

I suppose the question came about from having a character that has Eldritch Heritage and only has Skill Focus due to it being a requirement. More specifically it's a Barbarian that will later become a Dragon Disciple; high Strength and Charisma, but low Intelligence and barely any skill points to spend (Most of which are going into the Knowledge Arcana prerequisite). Completely designed around fighting, not using skills.

Thanks for the answer. I was just curious if I could use those bonuses to maybe identify an enemy I'm fighting, but otherwise had no real plans to use the skill.

I've been playing an Angelkin Aasimar Barbarian recently that took Skill Focus Knowledge Planes at first level as a prerequisite for Eldritch Heritage. His racial and feat together would give him a +5 on the Knowledge check, but he doesn't have any ranks in it yet. Knowledge and some other skills can be used untrained, though only those with a DC 10. Would I simply be hitting that cap really easily, or could I make harder checks?

What about an even more extreme case of a level 3 Grimspawn Tiefling that has the Vagabond Child trait, Deft Hands, and Skill Focus Disable Device but no ranks in Disable Device? That's a +8 to something they possibly can't use without proper "training". Would this character be some kind of trap stopping prodigy that simply hasn't unlocked their potential? Could they make checks against simpler devices and locks?

That does seem like enough inborn talent to at least give it a shot (maybe with some kind of penalty), but I'm wondering if there is an official PFS rule.