39+ Royal Cookbook Location Botw. Breath of the wild (2017). It is an ornate armor worn by the guards of castle hyrule, and it was added to the game in the champions' ballad dlc.
Been trying to upgrade the rubber armour.
To complete this quest head to the library in hyrule castle. So far only epona, royal stallion and the giant horse can be modified in the slots. We have a book for every trending style of cooking and some filled with traditional favourites plus recipes for cocktails, pressure cooking and even definitive guidance in the fine art of preserving. He's the only character in botw who can expand your weapon, shield and bow inventories and also the only one who makes use of all those korok seeds you keep finding scattered around.