Massive Egg

''"Few eggs are as massive as the Massive Egg. The only known egg that is more massive is the rare Petite Egg. It is not clear why they're not named accordingly but chances are it's some kind of crude joke to confuse egg lovers everywhere." - The description found in eng.translation''

A Massive Egg is a pickup you can find in Cobalt's Classic Survival, Waves Survival, and Story Modes. In Classic Survival, it could be converted to volts, but in Waves Survival and Story Mode, it is converted to volts upon being picked up.