Wan choose a curved sword that was about 1.4 meters long and was created from a bone of a Bronze Core monster. The sword was flexible, although not as much as other swords that were created from metals, it was sturdier and its cutting power was above others.
Olman, on the other hand, chose a bow that was created from a tree that was about 120 years old. The black wood of the tree was very bendy and could allow Olman to shoot incredibly fast and powerful arrows. The bowstring was made out of the tendon of a Bronze Core monster and it was not easy to pull it, luckily Olman had gained a good increase in his strength stat after drinking the blood and he was able to use the bow quite proficiently.
He also needed a quiver and arrows. Since buying hundreds of arrows in order to use them, later on, was not that beneficial, the many craftsmen of the world of Corleon had come up with a genius idea, one that took them decades to finally realize.