A random Very Rare Magic Item

Lantern of Chagrin

This lantern is found deep in caves and dungeons where failed adventurers have caused a curse to befall it. When lit, it casts bright light in a 40-foot radius and dim light for an additional 40 feet. But while lit, it also causes all creatures within a 40-foot radius to feel extremely bummed out. Those creatures roll Charisma checks and saves with disadvantage. Targets of Charisma-based spellcasters roll saves with Advantage.