Hematocritical 
Feat 10
Source Pathfinder War of Immortals
Prerequisites Bloodrager Dedication
Requirements Your last action was a Strike that critically hit a creature that isn't immune to bleed damage.
You bathe in the arterial fluids of your enemy, drinking deep of their freed essence to empower your magic and increase your spellcasting efficacy. If your next action is to Cast a Spell that requires a spell attack roll, you roll the spell attack roll twice and use the better result; this is a fortune effect. Alternatively, if your next action is to cast a spell that requires the creature damaged by the triggering strike to attempt a save, they roll twice and take the lower result; this is a misfortune effect.
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.
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.
RageYou must be raging to use abilities with the rage trait, and they end automatically when you stop raging.