The Egg Serpentleaf is the first boss of Sonic the Hedgehog 4: Episode II, fought at the end of Sylvania Castle Zone.
This boss starts looking like a rehash of the Aquatic Ruin boss; however, tentacles rise from the ground, smashing the totem poles revealing the true boss which snaps into Eggman's Egg Mobile like a giant living techno plant.
To fight this boss, the player(s) must fly up with the Copter Combo and hit the Egg Mobile when it is not encased in the plant, while avoiding the slamming tentacles. When the boss has half-health, more tentacles rise to attack the player(s).
When the boss is down to its last two hits, the tentacles attach themselves to the trunk of the plant and begin absorbing power from the earth. After a few seconds, Eggman unleashes a laser that spans the length of the screen and fires it in a clockwise rotation around the entire screen, which must be avoided using the Copter Combo. To stop the attack, hit Eggman without hitting the laser. Repeat once more to destroy the robotic plant.