Miracle tea (Divinity: Original Sin 2)

Spoiler




Question about tea, which the wife Kemma at his home in ARKS sells. It all kind of effect?) Green minus two to the value of all the skills in OD and black 75 resist to fire for three turns, what drinking tea is not worth OD points. It's cheat, especially green. At first I thought I have a bug, I decided to Google, but nothing about tea, nor about aunt found nothing, although this is the strongest potions work)