Valley of Screams

So... If Lintenluna sent you to me, I don't need to talk long. What I need is Firefly Grass that only grows in the Valley of Screams. The grass is very rare. It can be used as ingredients for food, medicine, and even magic. But the grass grows only in the valley. My theory is that the energy released before the immediate death of someone in the valley is converted to life energy in the grass! I will know more about the grass once you get it for me. Go to the Valley of Screams south of Deribelle and find me Firefly Grass... Yes? What? I can't hear you. Hurry up and get me Firefly Grass!

... What? What? I can't hear you. My hearing is not as good as it used to be. Leave me alone now. Go. Go to the Valley of Screams south of Deribelle and find me Firefly Grass...

... Yes? You got it.? Good, good. Then let's start the experiment. Ah... I almost forgot. Listen to me for a minute.