Medal of Wit

D&D 2014 item: Medal of Wit. Source: Critical Role: Call of the Netherdeep. type Wondrous Item, Common rarity You can press this medal to your temple as an action. Doing so gives you advantage on Intelligence checks and Intelligence saving throws for 1 hour. Once this property has been used, it can't be used again, and the medal becomes nonmagical. Wondrous Item Common

Source: Critical Role: Call of the Netherdeep, p. 214 - Licenses and attribution