Whack the crate to get some Mana, then use your Lightning ability to whack all of the spawned bushes at once. Talk to the Castle Steward when you're finished.
Zone Received In: Haven Castle Training Room
Previous Quest: A Powerful Ability
Stage 1: Whack the Crate
Stage 2: Whack the Bushes using the Spell Whack
Stage 3: Talk to the Castle Steward
Reward/s: Training Comendation, 15xp (!)
Next Quest: The Skittering Critters