Otro's skill spread vicariously through Choon, his talented apprentice. While Choon wasn't ready to take on his own apprentice, strictly speaking, he was more than welcome to aid the curious should they ask him specific stone-working questions. Because of this, Otro's handiwork and gathered skill became the standard against which all other stone tools were judged. However, Otro became curious as to a different way to attack from a distance, in an effort to level the playing field against the Lost Boys. Sure, the throwing axes worked, but could something work better? Just as accurate and deadly as a spear thrown from a Lost Boy's Atlatl? Otro wished to extend the length of a throwing arm, and devised a simple hide pouch loaded with a round, dense projectile. It had a strap on one end and a loop on the other (the finger of the thrower goes through the loop and is released at the best time). The sling would be loaded and whirled around the wielder's head, then the "bullet" would be released and launched quite a distance, with a mean of 400 meters provided the proper trajectory. Given the greater strength of the neanderthals, larger stones on average could be used, between 100-500 grams. Otro also realized the sling could be made even more powerful if attached to a wooden shaft, and when the outside of the "arm" reached the proper speed, the sling would release automatically. This way, the already prodigious distance the object would be lengthened by further extending the leverage of the human arm than a simple hand-sling. Ammo for this weapon was literally found everywhere around the user. Better yet, the hand-axes Otro made could be loaded into the sling as well. The device spread like wildfire among the plains tribes, and when proper skill had been developed, it became the weapon of choice in hunting game and combatting Lost Boys at a distance.