All Howl's Eve is a monthly event which lasts for a day. It happens on a random day every month. During that time, players can go to the Halls of Valhowla using a Challenge of Fenrir to find 4 special Valhowla Treasures in 3 minutes. Dark Cave Backgrounds and Climbing Walls are abundant there.

From Treasures (in order)
5x ItemSprites.png Wolf Whistle
5,000 ItemSprites.png Gems
1x ItemSprites.png Head Bangin' Steel Wolf
1x ItemSprites.png Ghost Wolf Monocle