Defeat the Elrokians who are raiding the Primeval Isle Wharfs warehouse and receive a reward from the warehouse owner
1) This quest starts out from NPC Dinn on the Primeval Isle Wharf area. He says that there have been some Elroki who have been raiding their supply trips, and offers to pay you to kill them.
2) The Elroki are located in various places around the Primeval Plains region of the island. The drop rate of the quest item is about 50%.
3) Once you collect 100 of the necklaces you can turn them in and take the Merchants donation, for a lump 100-necklace reward of 450K adena. Or you can turn in what you have for a 3K per necklace reward each. Essentially the bonus for bringing back 100 necklaces is 150K adena.