Explosive Keg is an ability for the Gunner kit in Battlefield Heroes. It is used as a weapon that explodes when either left to detonate or when it is hit by a bullet. Upon activation, the gunner will throw a keg full of explosive material. The keg will then explode when hit by a bullet, or is left to detonate when thrown on the ground.
This can be used against tanks, clusters of infantry or what appear to be empty flag points. Since the Heroes of the Fall Update, the Explosive Keg slows commandos, whether in Stealth or not, to something akin to the speed of a gunner. This is very useful to gunners because it takes away the commandos most important edge which is speed. Speed is essential to commandos because it allows them to not only escape, but gives them an overall advantage in combat. Before this update, the Keg, much like Burning Bullets, lit enemies caught in the blast radius on fire. Now, enemies are only caught on fire when it is Level 5.