[Darkmoon Faire] [Warlock] easier "That's Whack!" achievement

You can activate Burning Rush right before entering the whack-a-gnoll arena and it won't fade away as long as you have the health for it.

This means you're moving at 150% speed for the entire duration, making it easier to hit gnolls.

Of course, peccing Grimoire of Sacrifice for the extra healing helps you maintain it.