Ring Boomerang

Ring Boomerang (リングブーメラン) is Ring Man's special weapon. It has a somewhat limited range and, as its name implies, boomerangs back. But it can do multiple hits if aimed correctly. It's Dust Man's weakness, but Dust Man is immune to the Ring Boomerang when he has his vacuum on. It is also the weakness of Mothraya and Tako Trash. The Ring Boomerang can also pierce some shielded enemies, like Shield Attacker and Skull Man's Skull Barrier. In Mega Man IV, the Ring Boomerang can take items and pull them to Mega Man.

The Ring Boomerang is also used by the "Bridge" in Mega Man IV and the Weapons Archive in Mega Man 10.

Ring Boomerang is the only weapon besides the Dust Crusher and Mega Buster to be able to damage the Cossack Catcher.

Damage Data Chart
Known damage values in units for Mega Man 4.

Capacity
One Ring Boomerang uses 1 weapon energy unit in Mega Man 4, and 2 Ring Boomerangs use 1 unit in Mega Man IV. With a full weapon energy gauge, Mega Man can use Ring Boomerang 28 times in Mega Man 4 and 38 times in Mega Man IV.

Bosses weak against Ring Boomerang

 * Mega Man 4: Dust Man, Mothraya, Tako Trash and Wily Machine No. 4 (1st form)
 * Mega Man IV: Toad Man

Other media
Mega Man uses the Ring Boomerang in the Mega Man cartoon. 