Silex

Silex is an item that allows players to add 1 level of Efficiency to a pickaxe or drill through an anvil. Currently, the only way to obtain this item is through the Auction House or through player trading. It is expected to be released with the Crystal Hallows on June 6.

Trivia

 * This item was originally 'released' for a day accidentally, alongside the Flamebreaker Armor.