Star Card

D&D 2014 item: Star Card. Source: The Book of Many Things. type Wondrous Item, Legendary rarity As a bonus action, you can speak a command word while holding this card aloft to gain advantage on all saving throws you make for the next 10 minutes. Once this property is used, it can't be used again until the next dawn. Wondrous Item Legendary

Source: The Book of Many Things, p. 15 - Licenses and attribution