Spider-bane  

'This spider-queen -- Iornaith by name -- and her ways are known to me. She will have hidden herself in Sprigley's house and blocked all the entrances, save one.

'If you search the tunnels below the house, I would wager you will find a hidden passage leading to Iornaith's lair. The vile thing must be slain, or Archet will be overrun by her brood.

'Would that I were hale and could heft an axe! But that time has passed. Now, the mantle of Spider-bane must pass to you, if you'll have it.'

An ancient spider-queen has pursued Atli Spider-bane to Archet and invaded Cal Sprigley's farm.

Objective 1
Defeat Iornaith

Sprigley's farm south of Bronwe's Folly. One entrance to the spider tunnels lies through the cellar of Sprigley's shed, while the other is through the cave mouth due west of the Hunter's Lodge.

To prevent Iornaith's brood from overrunning Archet, Atli Spider-bane has asked you to find and slay the spider-queen. Atli suggests searching the spider caves beneath Sprigley's farm for a secret entrance into the Iornaith's lair.

Objective 2
Talk to Alti Spider-bane

Atli Spider-bane can be found at the north end of Archet, west of the spider-cave, north-west of Sprigley's farm.

You should take news of Iornaith's defeat to Atli Spider-bane.

This is no-linger a Fellowship quest. It is soloable at 11 (at least by a Warden) and maybe lower by others. Iornath does not heal anymore. Just burn her down.

To get to her, whichever path you take, from the big, square chamber take the down-sloping tunnel on the west wall.