
Grizzled Gryphon |

If a caster uses a spell, such as charm or dominate, on a target, and the target saves, does the caster know that it didn't work? Can the target, assuming it knows what spell was just cast on it, make, say, a bluff check, or something similar (perhaps a Perform: Acting check?) to trick the caster into thinking the spell actually worked?

Johnico |

From the section on saving throws on the PRD:
PRD wrote:
Succeeding on a Saving Throw: A creature that successfully saves against a spell that has no obvious physical effects feels a hostile force or a tingle, but cannot deduce the exact nature of the attack. Likewise, if a creature's saving throw succeeds against a targeted spell, you sense that the spell has failed. You do not sense when creatures succeed on saves against effect and area spells.

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There are Subject, Effect, and Area spells. You only know when they make the save vs a Subject spell.
Effect: Some spells create or summon things rather than affecting things that are already present.
It is all in the Magic Section of the Core or PRD.