56 Leaf Clover

The is an  item in Risk of Rain that gives Elite mobs a 1% chance to drop items. This item caps at 100% chance at 100 pickups. There can only be 1 item dropped by, i.e. 1 item for elite monsters, 2 items for elite bosses(1 for boss, 1 for clover).

Note: If a Scavenger is present on the final level and the player activates the Providence fight, the 56 Leaf Clover will be unlocked without having to actually kill the Scavenger.

Item Synergies
Have this item in conjunction with the Honor artifact. (Untested by writer as of this point)

Theory as to why this would work: This item grants a 1% drop chance per mob killed, the Honor artifact makes all mobs elite.

So, each kill has a chance at dropping something. (Also recommended to have the Command artifact so that you can choose this item)

Trivia

 * The Clover is called "54 Leaf Clover" in the achievements screen.
 * It is a reference to the Guinness world record for the most leaves on a single clover stem. 4 leaf clover is considered to bring good luck, so 56 leaves must be even luckier.

Gallery
56 Leaf Clover