Serpentine is fought a number of times in Freedom Planet, varying on the chosen character: If the Player is Lilac, he will be fought 3 times; if the Player is Carol or Milla, he will be fought 2 time.
Fortune Night Fight
Serpentine is the Mid-Boss of Fortune Night in Lilac's Story. In Adventure Mode, a brief cutscene will play, showing him confronting Lilac and scolding her for "walking into this conflict". After an argument between the two, the cutscene ends and the Mid-Boss Fight begins. After attacking, Serpentine will dash quickly to outflank the Player, alternating directions each time. Once he's taken enough damage, Serpentine will fall back and jump into his ship, which speeds towards Lilac, who runs away to avoid getting hit. Eventually, his ship will eventually hit a brick wall and break in two, with the lower half going through the narrow passage, while the upper half falls on top of Serpentine. In Adventure Mode, when Lilac walks back to the crashed ship, she'll say " You had it coming Snake Man!". Shortly after, Serpentine will break out and pursue the Player through Zao's Shopping Paradise.
Jade Creek Fight
Serpentine is also the Phase One End-Boss of Jade Creek. After Team Lilac fails to save Torque from being captured by Syntax and taken away via the Absolution, Serpentine appears behind them, itching for revenge. Before this fight, the Player can obtain a Water Shield. Serpentine's attacks are the same as they were in Fortune Night, except one of his attacks have a wider range, making it easier to avoid. Once enough hits are dealt, Serpentine will fall into the background, dropping 3 Health Petals in the process. Then he'll reappear, piloting a Gunship that can deploy Shade Elites to attack the Team.
|Plasma Burst||Serpentine fires 3 weak shot from his Plasma Pistols. These shots are easy to avoid at point-blank-range and can be deflected by Milla's Shield.|
|Plasma Storm||Serpentine will take out 2 Plasma Pistols and fires a torrent of shots into the air, which will then land near him. He will also generate a shield to protect himself from attacks while he's firing. This attack's Area-of-Effect is increased during the Boss Fight in Jade Creek, making it easier to avoid. It can also Stunlock the Player if they're careless enough to jump above Serpentine while he's firing. Milla can block the falling shots if she's carrying a Phantom cube.|
|Flamethrower||Serpentine will launch a stream of flames up and down in the Player's direction while occasionally jumping forward.|
|Wrist Missile||If enough distance is put between the Player and Serpentine, he will fire a missile that slowly traces the Player's movement and locks on to them.|
Final Dreadnought 2 Fight
Serpentine is also the End-Boss of Final Dreadnought 2, taking the form of a cyber-mutated monster.
At the end of Round 2 in Final Dreadnought, the Player will find Serpentine, who appears to be injured. Suddenly, he mutates into a larger, more draconic version of himself, making him faster in a pinch and his attacks dangerously stronger. Before this fight, the Player can get 4 Extra Lives, and a 5th if they time a jump just before the floor gives out. Also, there is a bottomless pit, so the Player must not be reckless with Lilac's Dragon Boost. When close to being defeated, Serpentine's face will break, with one of his eyes hanging out. Once defeated, Serpentine will explode, with only a few parts of his armor left behind, ending the fight and the Stage.
Mutant Serpentine's Attacks
|Plasma Punch||Mutant Serpentine will charge at the Player with a plasma-charged punch, easy to avoid at point-blank range.|
|Plasma Wave||Mutant Serpentine can throw the energy from a Plasma Punch onto the ground, causing it to speed towards the Player.|
|Spread Shot||Mutant Serpentine can fire multiple shot simultaneously in 4 different directions, able to inflict Stunlock on the Player. Before firing, laser light come out of his hand, hinting the direction of each shot. These shots can be deflected by Milla's Shield.|
|Flamethrower||Mutant Serpentine launches a stream of flames that move in a Zig-Zag pattern. The flames can be deflected by Milla's Shield.|