pf2e.fyi
From Pathfinder War of Immortals, which isn't enabled.

Blood Calls Blood

FEAT 4
ARCHETYPEFORTUNE
Activity reaction
Prerequisites Bloodrager Dedication
Trigger You fail a flat check to Cast a Spell or your spell would be disrupted by another creature's reaction.

The magical potency of your blood will not be denied. You finish Casting the Spell, then become Drained 1 or increase the value of your drained condition by 1.

Pathfinder War of ImmortalsORC