Hunt dinosaurs on the Primeval Isle and obtain a new A Grade weapon blade
1) This quest starts on the Primeval Isle Wharf area, with NPC SingSing. He tells you to collect bones for the islands native shaman Karakawei, and he will pay you for bringing him the bones on behalf of Karakawei. He tells you the bones come from Wild Strider and Pachycephalosaurus.
2) The Wild Strider and Pachycephalosaurus are located in the Primeval Plains region. The drop rate of the quest items was not 100%.
3) You can return to NPC SingSing and turn the bones in for an average adena reward of 1374a per bone.
Your other option is to seek out the Island Shaman on your own and offer 300 bones to him. The shaman Karakawei is located on the Elroki Island at the south of the Primeval Isle, and you get to it by speaking to the NPC Orahochin on the south of the Primeval Isle who teleports you over to the Elroki Island.
If you give Karakawei 300 bones, he gives you a random 5 Top A-Grade blades/staves/heads.