Ufelmia's Membership Fee

From the introduction: Ufelmia the Tinkerer has been paying her membership fees to the Artificer’s Guild in fragile gold! This metal looks genuine but becomes brittle under direct sunlight. The Guild is furious! Their debt collector was sent to her tower and hasn’t returned so a party of adventurers is needed to recover the 20,000 crowns Ufelmia owes. They are promised a cut of 10,000 crowns.