Weirdo
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Preacher Archetype lets you reroll an attack as a free action.
Fortunate Charm lets you reroll skill checks and concentration checks.
| lemeres |
Dip into oracle? Well, that might not be the best suggestion, since that carries a lot of weight that needs a lot of dedication. Especially the best way to get rerolls: Dual-cursed.
That has two different revelations related to rerolls, one of which acts like a hex (in that it only limits how many times per day you can use it on one person, not total) that forces a reroll one per day. It could be useful if one of your party members simply bombs a save.
Ferious Thune
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Insightful Gaze to re-roll Sense Motive.
Intimidating Gaze to re-roll Intimidate.
<EDITED - Ok, not exactly re-rolls, but roll two dice, take the best one.>