Since long before Orcs and undead crept into the Lone-lands, the Eglain has had to deal with the menace of spiders dwelling within the ruins across the lonely stretch of Eriador. Now as the spiders are driven from the depths of their ruined homes they creep closer and closer to Ost Guruth and threaten the Eglain who dwell there.
'No doubt you've seen spindly crawlers weaving their webs and trapping their prey, which happens to be anything that has life within its veins. Crawling monstrosities is what they are! Nothing good comes from them, and I have seen too many fall prey to their hidden nests.
'These foul vermin do not deserve the life they take so freely. Bring my vengeance upon them!'
Spiders dwell in the shade of Amon Ros, west of Ost Guruth.
With undeniable hatred towards spiders, Tortwil asked you to enter the ruins of Amon Ros to strike at the vile creatures dwelling there.
Tortwil awaits your return at Ost Guruth, east of Amon Ros.
You should return to Tortwil and tell him of the destruction wrought upon the spiders. He should be pleased with your success.