Buried Treasure
From Clumsy's World Wiki
This quest starts with Nahas the Treasure Hunter in Plane of Mischief on the South-east wall.
He asks you to collect 4 x [Mischief Mushroom Spores] by killing mushrooms in the forest area of Plane of Mischief.
Kill mushrooms in the forest to get the spores.
Give 4 Mischief Mushroom Spores to Nahas and there is a ~30% chance that it will spawn a a buried treasure chest