Poison or Medicine?

Add 10 doses of snake venom into the beaker with the potion, then bring it to Karrok Stout-Hearted in the Glittering Wing village on the Green Cape.

Oh, my forgetful head! I completely forgot! The main potion component is venom of a tropical horned viper. Without it, this potion was and will remain poisonous. But with that venom... Do you know the proverb: "Treat like with like"? This is exactly how this potion works. Snake venom neutralizes the toxins in tree-frog slime, and the resulting compound, when it enters the patient's body, forces them to fight the illness with all of the might, and defeat it.
Don't you want to save the chief of our new friends? Then help me complete my task. The beaker that I gave you contains an almost prepared potion. All you need to do is add snake venom, ten doses, and have the chief drink the mixture. I hope I calculated dosage correctly...

Quarr... I asked you not to bother me...

What? Young lady with blond feathers on her head wants to treat me? Kha... She thinks she can treat children of the Wind?