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Ferocious Will 
Feat 9
Source Pathfinder Lost Omens Draconic Codex
Frequency once per hour
Trigger You succeed at a saving throw against a magical mental effect.
You send a blast of magical feedback at the effect's source, dealing ceil(@actor.level/2)d6 mental damage with a will save against your class DC or spell DC, whichever is higher. If the target critically fails, it's also Slowed 1 for 1 round. At 11th level and every 2 levels thereafter, the damage increases by 1d6.
Traits
Common
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.