Egg Serpentleaf is the boss of Sylvania Castle Zone in Sonic the Hedgehog 4: Episode II. It is a giant mech looks like a snake combined with a flower and is piloted by Dr. Eggman. It can transform into a flower and it has a gun below the Egg Mobile. The Egg Mobile itself is set on the dome of the mechanic plant and is the only place, where the player is able to damage it eight times.