Treasures are valuable items found throughout the game that can be sold to the Duke for Lei. These include Crystal Fragments, various gems, and unique artifacts like the Azure Eye or the Large Pigeon Blood Ruby. Some treasures are combined to form even more valuable items (e.g., combining a gem with a statue). Collectibles include the Goats of Warding and various files/documents that flesh out the lore. Actively seeking out treasures is the best way to fund your weapon upgrades and purchases.
