Soothsalts

Soothsalts are derived from a naturally occurring crystal geode. Soothsalts are consumed orally in small doses, and frequent users can be identified by the telltale crimson stain around their mouths. A creature subjected to soothsalts gains advantage on all intelligence checks for 1d4 hours. 
For each dose of Soothsalts consumed, the creature must succeed on a DC 15 Constitution saving throw or gain one level of exhaustion - an effect which is cumulative with multiple doses. 
Soothsalts may be worth quite a lot of money to the right buyer, but are often illegal to trade.

Raw materials & Components

Soothsalt Geode