Mage’s Blood

Potion, uncommon

This flask contains a viscous liquid that can be smeared on a weapon or up to 10 pieces of ammunition as an action. When you hit a creature with a weapon or piece of ammunition coated in the liquid, the target must succeed on a DC 15 Constitution saving throw or be poisoned for 1 minute. While poisoned this way, the creature has disadvantage on saving throws against spells and other magical effects.