Sharkey's Men and their half-orc allies from the South have blockaded the Vale of Andrath, inhibiting trade with the southern nations.
'There is a leader among these fiends -- Sharkey's lieutenant in Andrath. I have seen him, a burly fellow -- a Man not a half-breed. He makes his lair high in the south-western ruins and barks orders out to all these fools.
'He must be dealt with. Perhaps, without a leader, the brigands will not recover, buying time for more to join the fight against this Sharkey.'
Sharkey's Lieutenant can be found at his perch, high and far to the south-west, within the Southwatch.
Watcher Brittleleaf wants to see the leader of the forces at the Southwatch slain.
Watcher Brittleleaf awaits your return to the east of the northern entrance of the ruins.
You hunted down and defeated Sharkey's Lieutenant, but the brigands and half-orcs seemed unaffected by his defeat.