The light green one

"What does the green one do?" You ask and Kruya takes the small bottle out of the case. "It represents the snake's tail you found. It makes you grow bigger in size. This amount here will make you grow about 16 and a half feet tall. This one is very dangerous and I advise caution. You'll grow back in a few hours of course."

You think this one sounds really creepy, but turn red as you start thinking how cute the little girls would look and feel like all big.