Lesson of the Splintered Aegis 
Feat 10
Source Pathfinder Battlecry!
Prerequisites Iridian Choirmaster Dedication
Requirements Your last action was a Strike that dealt damage to an enemy.
With your attack, you demonstrate to your student a hole in your enemy's defenses. Before the beginning of your next turn, your student can roll their next Strike or spell attack roll against that same enemy twice and take the better result.
Effect: Lesson of the Splintered Aegis
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.
ConcentrateAn action with this trait requires a degree of mental concentration and discipline.
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.