Paladin's Hammer

Rare Drop from the Paladin, who is only found in Hardmode Dungeon. It is an extremely fast returning boomerang, which has one of the shortest ranges for a boomerang-classed weapon, but if it gets the proper equipment, one can find this weapon to be one of the deadliest weapons they have ever come across (Up to 213 Damage with the right equipment). This weapon hits through enemies, proceeding until they hit a solid wall or reach the limit it can go before returning, allowing for insane accumulative damage against enemies such as the Destroyer. When coupled with the Frost Armor's inflicted Frostbite debuff, which affects each segment of worm enemies, a single player can tear the Destroyer down in around half a minute.

Trivia

 * The item is likely a reference to Blizzard games, in which the traditional weapon for the paladin class is the hammer. In Diablo 2, the Paladin class' Blessed Hammer ability produces a similar effect of magical, flying hammers.
 * This item could also be a reference to Thor's hammer Mjolnir, due to the fact that when thrown it returns to the user's hand.