There are 4 pieces of Master Ore to find to upgrade Link's Master Sword, 1 piece found in Skull Woods Dungeon, 1 piece found in Dark Palace Dungeon, 1 piece found in Thieves' Hideout Dungeon & 1 piece found in The Philosopher's Cave (Lorule Graveyard region). Hylian Shield found in Turtle Rock Dungeon, floor B1, kill all Wizzrobes in centre room to make chest appear.