Guiding Words 
Feat 18
Source Pathfinder Lost Omens Divine Mysteries
Prerequisites Mortal Herald Dedication, master in Diplomacy
Frequency once per 10 minutes
Your words speak divine truth, guiding blades and arrows to their mark. Choose an ally within 30 feet and attempt a diplomacy check. The DC is equal to the hard difficulty DC of the level of your ally. On a success, the first time the targeted ally makes an attack roll before the end of their next turn, they roll the attack twice and use the better result.
Effect: Guiding Words
Regardless of the result, the target becomes immune to Guiding Words for 10 minutes.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
ArchetypeThis feat belongs to an archetype.
AuditoryAuditory actions and effects rely on sound. An action with the auditory trait can be successfully performed only if the creature using the action can speak or otherwise produce the required sounds. A spell or effect with the auditory trait has its effect only if the target can hear it. This applies only to sound-based parts of the effect, as determined by the GM. This is different from a sonic effect, which still affects targets who can't hear it (such as deaf targets) as long as the effect itself makes sound.
ConcentrateAn action with this trait requires a degree of mental concentration and discipline.
DivineThis magic comes from the divine tradition, drawing power from deities or similar sources. Anything with this trait is magical. A creature with this trait is primarily constituted of or has a strong connection to divine magic.
FortuneA fortune effect beneficially alters how you roll your dice. You can never have more than one fortune effect alter a single roll. If multiple fortune effects would apply, you have to pick which to use. If a fortune effect and a misfortune effect would apply to the same roll, the two cancel each other out, and you roll normally.
LinguisticAn effect with this trait depends on language comprehension. A linguistic effect that targets a creature works only if the target understands the language you are using.