Translations:Bosses/6/en

Proximity detonation occurs when the player stays too close to Billy Boom for too long. When in the immediate vicinity of Billy Boom, a warning bar will slow increase at the top of the screen below the boss health bar which, once full, causes Billy Boom to explode, instantly killing the player. Self destruct is similar, but instead triggers when Billy Boom reaches around 1/5th of its health pool; in this state, Billy Boom will collapse to the ground and any damage dealt to it will increase the warning bar with the same effect as previously. The player can disarm Billy Boom by pulling the lever located on his back to continue the fight.