Proof of Tenacity

Objectives
Obtain a Conqueror's Trophy from the commander of an Assault in the Vale of Eternal Blossoms.
 * Conqueror's Trophy

Description
If the Highkeeper is so convinced that we don't stand a chance against our enemies, perhaps a show of force would sway him.

I am not sure how you would manage, but if you could bring proof of a victory against those who threaten the Vale, it may convince him that action should be taken.

Rewards
You will receive:
 * Choice of Azerite armor
 * Vest of the Insatiable Maw, Visage of the Insatiable Maw, or Mantle of the Insatiable Maw
 * Radiant Azerite Matrix (1,500 Azerite)
 * +350 reputation with Rajani
 * 8,950 XP
 * 8,950 XP

Progress
What is it this time?

Completion
So, you've managed to defeat one of the Vale's would-be conquerors? A notable feat, but Azeroth's enemies are innumerable.

The Burning Legion, the Old Gods, the Void... sooner or later the scales will tip against this world.

...but I have been mistaken before.

PTR version
Obtain a Trophy of the Black Empire from one of N'Zoth's generals by completing a Black Empire Assault.
 * Objectives
 * Trophy of the Black Empire

I am not sure how you would manage, but if you could bring proof of a victory against this evil he speaks of, it may convince him that action should be taken.
 * Description