Reinforcements Denied (Alliance)

Objectives
Slay 3 Stonard Warlocks.
 * slain x3

Description
Just killing ogres won't be enough. The ogres themselves are being summoned onto the battlefield far too rapidly.

I need you to go far behind the enemy line and seek out their summoners. The orcs are using warlocks to bring their reinforcements in.

Cut down the warlocks, and the portals should close. There aren't many of them; a quick, surgical strike should cripple the enemy.

Rewards
You will receive:

Progress
Is there a problem, ?

Completion
Once again, well done. With a few more pushes the battle will be ours.