[Miller]

You can use them for crafts since there's no more RNG involved in crafting stuff at the same crafting level.

Ninja Armor, Sarasha Gi, Berserker Shell, Onigan Waraji being among some of them (There's more of course, but these are the major ones).

Recipes are in Dormeho Tailor/Karaten Pawn.

Edit: Ninja Armor is at Karaten Pawn under the Textbook of Torsos recipe book.