Knife Grinder

is one of the major disciplines, which were revealed on May 18th, 2017.

Grants the Powers

 * Tenderize
 * Cauterize
 * Long Live the Fighter

Can be equipped by

 * Assassin
 * Champion
 * Duelist
 * Knight
 * Legionnaire - this most possibly is a mistake, since it's from the old archetype concept
 * Myrmidon
 * Ranger
 * Templar