Breaker Blade

The Breaker Blade is a Hardmode sword. It is the largest sword in the game, and also has the most knockback. It is one of the possible drops from the Wall of Flesh.

Trivia

 * It is the largest sword in the game, and has the longest range. The Fiery Greatsword follows as the second-largest.
 * This item is a reference to the Buster Sword wielded by Cloud Strife in the game Final Fantasy VII. It is similar in both name (Breaker Blade / Buster Sword) and appearance, even having what seem to be a pair of "materia" attached, as can be done in the game.
 * The word "Breaker" may also be a reference to Final Fantasy VII's Limit Breaks.
 * The serrated edge may also be a reference to Warhammer 40,000's chainswords.
 * Ironically, you can get this sword in the handheld versions of terraria even though hardmode never starts!