From the manor's entrance, head to the right until you find a dirt path. Follow this and you'll find a golden door. Go uphill; there's a Silver Key behind the tree a bit north of the golden door. Further north of the Silver Key you'll find a pond. The area's only gnome is on the rocks.
At night the destroyed house is fixed again. Head to the pavilion and discover that gazebo is glowing blue. You can now interact with the statues there. You need to press A on each statue until they resemble their solid poses during the day. To make it easier, you need to change their poses 4 times. If done correctly the phantom house will materialize so you can enter it.
Sunset House Statue Puzzle
Warning: You won't be able to leave this house until you complete the quest.
Enter the house. You'll find a hanging skeleton there. Examine the note beside it to learn more about the curse. Ignore the warning and follow the trail. Sleep on the bed and you'll be taken in another dimension with a large chessboard on it. Talk to the chest in the middle of the board named Chesty. Start a game of chest with him.
Just play chess as you normally would. After a few turns he'll get bored and will have the chest pieces attack you instead. Speak to Chesty after defeating each wave. After getting rid of the last pieces, talk to him again to complete the quest.
Guild Seals: 20