Students of Untwisting Iron
The Students of Jalmeray are monks, fighters, and other warriors, who are sent to one of three highest specialized schools on the Isle of Jalmeray. Each of these schools focuses on one element: the Untwisting Iron, the Unfolding Wind, or the Unblinking Flame. Upon entering a school, the warrior gains the title of Student of the appropriate order, and when they end their study, they become Master. Many titles come in between, but most often Student and Master is used.
Every school has its own specialization. The School of the Untwisting Iron focuses on shrugging of blows, creating armor and transforming oneself into living metal.
Sources: Pathfinder Chronicles Campaign Setting, Own Stuff