Helm: Leyndell Knight Helm

Armour: Leyndell Knight Armor

Gauntlet: Leyndell Knight Gauntlets

Leggings: Leyndell Knight Greaves

Where To Find: 

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The set is dropped by any Leyndell Knight, encountered in locations such as the Artist's Shack in Liurnia of the Lakes, Leyndell Royal Capital, and the Altus Highway Junction Site of Grace within the Altus Plateau.