Mechanics
Mastery Oaths
Legendary weapons and higher require the matching Mastery Oath before they can be used. [1]
Details
Basic attacks, criticals and most abilities have hit-stun. [2]
Kharvos, on the second floor at the back left of the building called the Castle or Manor, changes Mastery for a cost. [3]
References
Community documentation; not tested in-game. Patch not stated. Sources checked .