Slay Minyoth, Whelptamer Akumi, Terromath the Seared, and Tugnar Goremaw.
The Blackrock orcs don't come alone. You've already seen that they've got the Firegut ogres and Smolderthorn trolls on their side. Unfortunately for us, they're also teamed up with the black dragonflight.
The orcs and the dragons have already sent some of their champions to stand guard at rally points, which are marked by a dragon skull on a pike. You and I are going to find these rally points and take out this vanguard before the battle starts.