Swig of Insight is an item in Tyranny.
Drinking distilled Insight increases the drinker's willpower and defense against spellcraft. For as long as the Tiers have recorded their history, caravans and explorers straying close to the Oldwalls feared that their passing would attract the Bane. The charms and wards that folk carried on their travels were naught but comfort until someone concocted a formula that offered a sharp mind and protection from arcane forces. This consumable's effect increases in strength as its user gains in power.