To craft the Shark Tooth Necklace in this Roblox title, you must interact with an NPC called the Shark Hunter who can be found in Tiki Outpost (a level 2450 island located in the Third Sea).

This article explains how to find the Anchored Terrorshark and obtain the Shark Anchor in Blox Fruits. It also sheds light on the moveset of the sword, so you can learn about its capabilities.