Grimvale Quest/Spoiler

Method
This quest starts at Grimvale. To reach Grimvale, travel to Edron and walk to Stonehome. To the north of Stonehome is a ferry run by Cornell. Ask him to sail you to Grimvale.
 * Warning: There is a new concept of "were-sickness" where you will become a were-beast after a certain amount of time. If you encounter the creatures on Grimvale, as you will, you may be infected by the were-sickness. If you are inexperienced you may want to think twice before going because getting the cure is not easy and you will be unable to ferry back to Edron as a were-beast.

Obtaining the Purple Nightshade
The were-sickness is curable by eating Purple Nightshade Blossoms. These flowers are hard to come by, being found exclusively in the Grimvale dungeon. To obtain Purple Nightshade Blossoms, go into the Grimvale dungeon by falling down the Pitfall at the north of the island. Head west all the way to find a hole to the next floor. Go down here and walk a bit north. You will find the first of only two Blooming Purple Nightshade flowers here. Use the Blooming Purple Nightshade flowers to obtain Purple Nightshade Blossoms. You can obtain Purple Nightshade Blossoms once from each Blooming Nightshade Blossom every 60 minutes. The second of the Blooming Purple Nightshade can be found on the east side of the cave.

Obtaining the Liquid Silver Trap
Although its purpose is not yet known, you can obtain the Liquid Silver Trap from Maeryn by providing her with a Closed Trap and Liquid Silver. You can buy the Closed Trap at general equipment stores, even from Gladys, for 280 gold. To obtain Liquid Silver, go into the Grimvale dungeon, third floor, and use a Pick (Secret Agent tools will not work) on a Silver Vein in the walls. When doing so you may not receive Liquid Silver, in which case you must wait 2 minutes and try again.