The Hōzen (宝箭) is the arrowhead stone Oliver Queen found around the neck of one of the corpses in the graves of Japanese soldiers on the Island. It is currently in the possession of Thea Queen, after being given to her by Oliver as a gift. On one side is a Buddhist inscription, and on the other is a set of numbers, particularly coordinates, leading to the Kairyu-class Japanese submarine which carried the Japanese military's only supply of "Mirakuru". It was being transported when the submarine came under heavy fire by the Allied Forces and ran aground Lian Yu during World War II.