Materials and rewards

Emerald Drill (Armor)

A legendary item that unlocks the 4th socket on your armor.

Sources

◇Bosses Death ReaperLevel 78↗ Event Chests Golden King's Loot↗ Boss Chests Razador Chest↗ Boss Chests Nemere Chest↗ Dungeon Chests Spider Baroness Chest↗ Event Chests Golden Okey Box↗