Wish Granting Moo Cow:
I will give you Lucky Pouch to scare away any misfortunes and disasters.
There are three types of Lucky Pouches: Growth (aquired XP/SP), Prosperity (aquired adena bonus), and Harmony (Vitality Bonus). I will give you the pouch, which suits you the most.
Oh, one more thing! If you don't need the Lucky Pouch you get, you can exchange it for another one. But you can do it only once.
Remember that exchange is only possible once for every character of Lv. 105 and higher.