This item can appear randomly on the PvP Reward Tracks, on the following checkpoints:
Checkpoint 2
Requirement
Player Level 60+
Checkpoint 2
Requirement
Player Level 60+
Checkpoint 3
Requirement
Player Level 60+
Checkpoint 3
Requirement
Player Level 60+
Check out our Azoth Salt and PvP XP article to find out where to grind it.