"Myths abound about armored phantoms that terrorized brave heroes. These greaves look just like the ones they supposedly wore. It's a rather rare find."
The Phantom Greaves are a piece of leg armor found in Breath of the Wild.
Breath of the Wild
The Phantom Greaves have a base defense of 8, and were released as a part of the first DLC expansion for the game: The Master Trials.
As part of the EX Treasure: Phantasma side quest, Link will find this piece of armor at the Hyrule Garrison Ruins. More precisely, they are located in a treasure chest that is buried underneath an inactive guardian at the southeast end of the ruins. Be sure to check our Interactive Map for an exact location.
After Link has obtained this item for the first time, he will be able to purchase it from Granté in Tarrey Town for 50 Rupees.
The Phantom Greaves are part of the Phantom Set, which also includes the Phantom Helmet and Phantom Armor. None of the armor pieces are enhanceable or dyeable. Individually, when equipped they will each give Link an Attack Up bonus.
The chest is at the southeast end of the Hyrule Garrison Ruins. Use Magnesis to more easily spot its location.