As an action, you can throw a vial up to 15 feet that shatters in a 10-foot radius, releasing a cloud of smoke and toxins. Each creature in the area must succeed on a Constitution saving throw (DC = 8 + your proficiency bonus + your Wisdom modifier) or become blinded and poisoned for 1 minute. Affected creatures can repeat the saving throw at the start of each turn to end the effect.
When an ally within 15 feet makes an attack roll, you can use your reaction to grant the attacker advantage on the roll.
You can use this bonus action a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a short or long rest.