Okay, I found it! It seems like the reason the tree has turned red is because the protective force that covers the forest, the barrier of the forest, might have been weakened. I don't know what caused this, but right now, we need the spell that temporarily strengthens the protective force that surrounds Minar Forest. I'm sorry, but you may need to help me out here.

Please take this letter to Chief Tatamo, and before you reach him, I advise you to gather up 5 Kentaurus's Flames, Kentaurus's Marrows, and Kentaurus's Skulls each. They can only be obtained at Minar Forest, and they're needed to strengthen the barrier of the forest.

And please make sure to tell him that this is temporary; returning the forest back to its original state will require solutions that attacks the very core of the problem.

Sigh ... who should I refer this to, then?

So what did Grendel the Really Old say?

1. He told me to give you these.

Here, let me take a look at it.

Ahh... this is the vintage scroll from Grendel the Really Old which is of most importance to the Halflings at this moment. This is the scroll that contains the spell that strengthens the barrier of this forest. Thankfully, you've brought the necessary ingredients for this. Great work. This should be good for a little while, but I'll need to find out why the Barrier of the Forest is weakened.

Anyway, thank you for your great work. The barrier of the forest seems to have weakened quite a bit, so I advise you to stay alert against possible monster attacks in the forest.