Bomb Arrow
A Bomb Arrow is a recurring item in the Zelda Series. it has appeare in two games, Link's Awakening and Twilight Princess. They are what Link gets when he combines his Bombs and his Arrows together.
Link's Awakening
In Link's Awakening, Link can use a Bomb Arrow by placed Bombs in one item slot and Arrows in the other. Pressing both buttons at the same time will result in Link firing off a Bomb Arrow. They are not required to beat the game.
Some people believe that this is glitch, and Bomb Arrows were never designed to be in the game. However, this has never been denied or agreed upon with by a developer.
Twilight Princess
Bomb Arrows in Twilight Princess can be equiped by placing Link's Hero's Bow in any item slot and then opening up his item selection screen and pressing the Z button when highlighting a Bomb Bag. they are required to beat the game.