Missing Assistants

Start by talking to Pikkupstix in his house near the member's gate in Taverley about a quest. His assistants, Scalectrix and Bowloftrix, have gone missing, and he asks you to find their whereabouts. Head southwest from his house, and west across the bridge and look for the well across from the watermill.
Talk to Scalectrix in front of well. She will inform you that Bowloftrix was captured by trolls. She asks you to go back to Pikkupstix and let him know what has happened and seek his help.

Item Hunt

He tells you of his idea to summon a giant wolpertinger. The best news is, you might even survive! He asks you to bring him his ancient wolf bone amulet, some white hair meat, and an embroidered pouch.
Head upstairs in his house and search the cluttered drawers in the northwest corner of the room to find the embroidered pouch. Head to the pet shop south across the road and talk to the owner about white hare meat.
Finally, head onto White Wolf Mountain from the path just next to the well in west Taverley. Run past the wolves onto the western upper path, and you should see the dead body of poor Stikklebrix. Search him for the wolf bone amulet.

Giant Wolpertinger

Return to Pikkupstix and obtain the last items from him. Finally he will tell you to infuse the items at the obelisk behind him. Speak to him to make sure it's ok, then return to Scalectrix. You will enter the well with her, and summon the Giant Wolpertinger and scare the trolls.

While the trolls are disoriented, you will grab Bowloftrix and hurry out of the well.