During the Battle of Ashenvale, you may obtain an item that starts the 'Clear the Forest' quest. It is not totally clear how you complete this quest, so here's how you can finish it in WoW Season of Discovery.
How to finish Clear the Forest! in WoW Season of Discovery
The quest states to bring a Silverwing Sentinel Charm to Kazragore at Bonefire base in Ashenvale. Bonfire base is not your standard camp/settlement, so it's not obvious where this location is. If you're having trouble finding Bonefire base, or you simply cannot find Kazragore, then you can find him at 39.4, 67.6.
As a reward for completing the quest, you will obtain the Warsong Battle Drum, which grants you a small damage and healing buff for two hours. This item binds when you obtain it, so it cannot be traded or sold at the auction house.
How to get a Silverwing Sentinel Charm in WoW Season of Discovery
Clear the Forest! is the quest gained from picking up a Silverwing Sentinel Charm from a Silverwing Guard during the Battle for Ashenvale. During the battle, three boss camps will spawn and the first faction to destroy all three of these camps will win the battle. The guards that drop this charm only appear during the Battle for Ashenvale, so be sure to be at the battle once it starts. I recommend being level 25 for the Battle for Ashenvale as it is a PvP-focused event.
For more helpful guides and useful information relating to World of Warcraft, check out Why are there so few of each kind of realm in WoW Season of Discovery? right here on Pro Game Guides.