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From Pathfinder Lost Omens World Guide, which isn't enabled.

Lastwall Sentry Dedication

FEAT 2
UNCOMMONARCHETYPEDEDICATION
Archetype Lastwall Sentry
Prerequisites member of the Knights of Lastwall; Shield Block
Access You are from the Eye of Dread region.

You've sworn yourself as a sentry for the Knights of Lastwall, the first line of defense against incursions by the Whispering Tyrant throughout Golarion. You become trained in Athletics and in Undead Lore; if you were already trained, you become an expert instead. Finally, you gain the Reactive Shield fighter feat.

Lastwall Sentry

Pathfinder Lost Omens World GuideOGL