This quest has been adjusted. Please abandon the quest and restart it by speaking to Landenel at Camp Tranquil. :
※The Main Scenario Guide shows the next available quest. You can toggle it on and off in Character Configuration, under UI Settings.
As Landenel feared, agaric flies have already taken notice of the brownie brushes. Having slain a swarm of the vilekin, collect a brownie brush as evidence.
You harvest a single succulent brownie brush. Deliver it to Landenel and tell him of the agaric fly infestation.
Landenel is unsurprisingly horrified to hear that you encountered agaric flies in the Lower Paths. All that remains is to inform his sentries...