He asks you to head into The Hideout-84.25, -73.70, -160.02 , which is adjacent to the Splitpaw Den, and destroy 10 gnoll supply crates. To do this you must move a barrel next to the supply crate and then detonate it.
Most of these crates are guarded by gnolls, but some are not. Players who can invis or stealth can sneak around and get some of these with no combat involved.
The reward is experience and fulfilling one of the requirements of the Darkened Shard quest.
I have been asked to destroy the supplies in the gnoll hangout for Flitch. The hangout according to these directions, is nearby the firepit where Sarchel tells his stories. Perhaps you can find some tools to help you with your task in the hideout.
Find a way to completely destroy the gnoll supplies.
Destroy the gnoll supplies!
I have destroyed the supplies.
The exploding barrel completely destroyed the supplies.
I have destroyed the gnoll supplies, preventing them from causing any more mischief.