Halo 3 Special

Ball - The objective item in the Oddball game type. It doubles as a melee weapon that can kill a normally shielded opponent in one hit.

Bomb - The Bomb is the key item in the Assault game type. The bomb is carried by a player, however the player can attack with the Bomb as a melee weapon so it can be categorised as a weapon too.

Classified - Classified is another cause of death similar to the Guardians. There are actually two separate ones. One is usually attributed to collision damage from objects, such as a high-velocity traffic cone. And the other is death by falling.

Explosion - You get a kill by this if you indirectly kill somebody by causing an explosion. For example you destroy a Warthog with normal weaponry and when it explodes the explosion kills an enemy nearby.

Flag - The objective item of the Capture The Flag game type. A player carrying the flag can use it as a melee weapon.

Guardians - The Guardians are the mysterious entities that Bungie blames for all deaths that aren't caused by players. Deaths from falling, map features like Snowbound's turrets, or anything else the engine can't explain are credited to the Guardians.

Melee - Weapons can be used for more than shooting. Bludgeoning is an excellent way to finish off a weakened opponent or sneakily dispose of an unaware enemy. Weapons vary in the speed of their melee attack, and support weapons cannot be used to melee. Like many aspects of the multiplayer game, melee attacks have seen changes since Halo 2.