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Hidden Potential of the Battlelord
Locate and unlock a hidden appearance for your artifact as a Warrior.
Hidden Potential of the Battlelord requires you to unlock a hidden artifact appearance as a Warrior, granting the Replica Forge of Odyn decor reward upon completion.
Unlock Your Class Hall
Before pursuing any hidden appearance, you must have your Warrior class hall unlocked and the base artifact for your chosen spec obtained.
Check Quest With Helgar
For the Arms hidden appearance, 
The Arcanite Bladebreaker, speak with Master Smith Helgar in your class hall to check if the Secrets of the Axes quest is currently available — there is no exclamation mark indicator, so you must talk to the NPC directly.
Travel To Dalaran
Once you accept the quest, head to Dalaran and speak with Saurfang at Krasus Landing to find the warrior with the axe.
Return To Class Hall
Return to your class hall to speak with both NPCs and complete the duel with Saurfang to finish the quest and unlock the hidden appearance.
Tips
Secrets of the Axes has a daily chance to spawn, and when it is available it is active for the entire region — check each day after the daily reset.