Boomer

Boomer, known as Rounder (ラウンダ) in Japan, is a virus from the Mega Man Battle Network series. It attacks by shooting a boomerang that travels along the outer walls of the field. It hits every panel except for those in the middle. It is invulnerable until it releases its boomerang as part of its attack, at the end of which it catches the boomerang and is once again invulnerable. Stronger variants of this virus utilize PanelGrab chips, stealing the center panel. While their attack has the element Wood and will deal double damage to Elec Styles in Battle Network 3, the Boomer Viruses themselves are Null Element and will not take double damage from Fire attacks.

Battle Chips
Boomerang (ブーメラン) is the Battle Chip from Boomer viruses.