Orcs are not the only evil creature to inhabit the Foundations of Stone. There are also vile spiders.
'We are coming to the end of this adventure, ${PLAYER}. My next task for you is more practical in nature. In order to face your greatest challenge, you will have need of the scent-glands of a spider.
'Now for mighty warriors such as ourselves, simply slaying a common spider won't do. No, you will have face the great spider, Luillë. She can be found in the Redhorn Lodes, lurking in the shadows.
'Come back to me with the glands, and we will see this adventure completed.'
Luillë can be found in the Redhorn Lodes, north of the Claw Hollow and just west of the Foundations of Stone.
Valthor has asked you to defeat the spider Luillë and bring him her scent-glands.
Valthor is at the Shadowed Refuge, east from the Redhorn Lodes.
You should return to Valthor with Luillë's glands.