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Flashing Shield 
Feat 8
Source Pathfinder Lost Omens: Knights of Lastwall
Prerequisites Lastwall Sentry Dedication, you worship a good-aligned deity
Trigger You use the Shield Block reaction, and the opponent that triggered the Shield Block is undead and adjacent to you.
Your shield flares with holy light as you block the attack, searing the undead with the power of your faith. The triggering undead takes positive damage equal to half your level and becomes Flat-Footed for 1 round.
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.
ArchetypeThis feat belongs to an archetype.