The demons of the Burning Legion think they can just walk up here and take whatever territory they want. Sure -- the territory was previously theirs, but that's besides the point.
Head to the Gates of Sothann and wipe out the contingent of Horrorguards that roam the area.
Rewards
You will receive: 7 80
Progress
Is it done yet, <race>?
Completion
Sharp as always. You do not disappoint me.
Notes
Pick up The Greater of Two Evils before heading out. Head west past the proving grounds, then turn south and head up the hill to reach the Gates of Sothann. Garnoth can be found at the western end of the gates, so keep that in mind when killing Horrorguards.
This concludes Mylva's quests. Do Devoran's and Ortell's quests to continue the storyline.