Here is the easiest way to Kill the Blue Yian Kut ku Get two Large bomb barrel+, stones, then get a pit fall trap, Felvine plant, get a iron sword and up grade it to And iron katana "Grace",and make sure you have plenty of potions.When you start the Quest slay the Great Kut Ku get the items out of the box and go straight to area 9. The Kut Ku should be there fasing the opposite direction set the pit fall trap and then get its attention by throwing stones at it. When it spots you get him to fall in the trap. when it in the trap set both bombs by it and then run away so you get a good distance from the bombs. Then throw a rock to set off the bombs. This weakens it a lot. From then on attack it from the side hitting the neck,wings and tail for those are the soft spot. Make sure you are doing the Draw slash methoid or it will be harder to kill. If you do this right it should take about 6 or less minutes.