Cracker jack prize
These ancient relics are greatly prized among collectors, coming from a period when monsters were much happier as an overall population. During this time, the Hero-Monster Interspecies Professional Sports League emerged where monsters and heroes played games for fun side-by-side. However, when one Monster got hungry and ate a few of the spectators during a particularly long game - the league was quickly dissolved before either team could be sued. The many problems that had always plagued Monster-kind resurfaced, and heroes were again fighting the Monsters in memory of the spectators who died before their time.
Any artifacts from these institutions are extremely rare and are often quite valuable, especially with some traders, who long for a future where Hero and Monster can once again enjoy a more palatable cohabitation. Prices as high as 700 gold coins have been reported!