Brute Shot
From Halopedia, the Halo wiki
Brute Shot
http://www.yesalbum.com/v001/thepretenders22/brute_shot.jpg
Summary
Very little is known about this weapon, only that the Covenant Brutes seem to favor this weapon to others. It seems to fire some kind of energy grenade at very high velocities that bounce off of and around most surfaces. The splash damage from this weapon is extremely high. It also has a very sharp bayonet-like blade on the underside of it that is used as a powerful melee weapon.
The grenades from the Brute Shot can bounce around corners and inflect heavy damage when the enemy is bunched up. The melee attack on the Brute Shot is very deadly, dropping shields with one hit.
The best way to treat this weapon is as a shotgun or a room clearing device. Also on the unsuspecting enemy the Brute Shot can make quick work if you line your shots up before taking aim.
Images
http://img171.exs.cx/img171/3044/bruteshotthumb7qe.jpg