There are two kinds of bosses in Shadow Fight 2 (Shadowland bosses and Eternals). Shadowland bosses are demons (who were once humans) that escaped from the Gates of Shadows when Shadow broke the "laws of the elders" by opening the gates, hoping for a worthy battle. Shadow needs to defeat the demons in order to obtain their seals and close the gates he once opened. Eternals are mysterious beings who awakened after gates were opened. The Demons are fought in the singleplayer mode while the Eternals are fought in the multiplayer mode.
Demons are the minions of Titan. All demons have 5 bodyguards. Players have to defeat all of the bodyguards before they can fight with the bosses. There are three rounds in each boss fight (with the exception of the Interlude fights). Each round can last a maximum of 99 seconds. There can be a maximum of 5 rounds.
- Main article: Lynx (SF2)
Lynx is the very first demon encountered in Shadow Fight 2. Lynx is the leader of a group of assassins known as "The Order". When he meets the player, he dismisses the player as a pathetic fighter, instead sending Shin to take care of the player. Lynx has five bodyguards who, once defeated, clear the way for the player to battle Lynx.
Lynx's weapons are his claws - which have a moderate range, high damage and outclass most of the weapons in the first province. Lynx is also the first enemy to use ranged weapons. His special ability is that he can throw down a smoke bomb and become invisible. When Lynx is defeated, he hands over the Blue Seal. Beating him will allow the player to buy ranged weapons in the shop. If the player defeats Lynx in Eclipse mode, they will get his claws as a reward.
During the fights with Lynx and his bodyguards, the track "Black Warrior" plays.
- Main article: Hermit
Hermit is the second demon encountered in Shadow Fight 2. He has five disciples which take the roles of bodyguards. All of them have names based on martial art styles. Hermit is famous for his mysterious power, which is revealed to be Magic.
Hermit has destroyed all other academies in the town so he can build his own school. It is revealed that Hermit's disciples resent him and only learn from him in an attempt to discover his secret and use it for their own benefits.
Dragon, one of Hermit's disciple, reveals that there is a competition, full of aspiring warriors that are trying to get a place at Hermit's academy. The winner will get to know Hermit's secret power.
Hermit wields a pair of one-handed swords as weapon and is the first enemy to use magic. He changes his ranged weapon to a new one each round the player defeats him. Hermit can use his magic quite often because of the fast recharge of his magic. First, he uses Lightning Arrow, then switches to Water Ball after the player defeats him twice. Hermit's special ability is that he can enter a transcendent state that allows him to summon lightning strikes at will. However, Hermit is unable to move while casting this ability, so Shadow can attack him at will. Defeating Hermit, he will reward Shadow with the Green Seal and his secret power, Magic. If the player defeats Hermit once more in Eclipse mode, they will get his weapon as a reward.
During the fights with Hermit and his bodyguards, the track "Old Sensei" plays.
- Main article: Butcher (SF2)
Butcher is the third demon encountered in Shadow Fight 2. As with Lynx and Hermit, he has five bodyguards. His first bodyguard is Bird, who attempts to ambush the three protagonists (Shadow, Sensei and May). She leads them to a secluded part of town saying that it will take their breath away, once and for all. Upon escorting them to her destination, she attacks, but Shadow manages to defeat her. Bird's defeat brings forth the rest of Butcher's Gang, directing the protagonists to Butcher himself.
Butcher is a bandit who raises children from a young age, training them to be violent and aggressive. Butcher was introduced by name in Act II to the protagonist by Hermit, who says that Butcher has been harassing Hermit for some time now because he seeks Hermit's magic.
Butcher wields a pair of meat cleavers, which cause bleeding effects on the player when he gets hit. His special ability is that he can stomp the ground, which causes a small earthquake. If Shadow is caught on the ground when he lands, he will lose a portion of his health as well as fall. Defeating him will reward players with the Red Seal. If defeated once more during eclipse, players will get his weapon as a reward.
During the fights with Butcher and his bodyguards, the track "Sparring" plays.
- Main article: Wasp (SF2)
Wasp is the fourth demon encountered in Shadow Fight 2. She is the daughter of The Pirate King. With her father missing, Wasp became the new Pirate King. As with the other demons, she has five bodyguards who have their names themed on the sea. However, the first 3 "bodyguards" are members of "New Blood", a rebel group comprised of the pirate crews that do not trust Wasp. The last 2 "bodyguards" are Wasp's loyal men.
Wasp wields a green naginata. Her special ability is that she can jump off the edges of the battlefield and swoop across the screen, damaging the player. However, the attack can be dodged by rolling or a well-timed duck. After defeated, Wasp reveals that she indeed killed the Pirate King after being manipulated by Widow. The reward for beating her is the Purple Seal. If defeated once more in eclipse, players will receive her weapon as a reward.
During the fights with Wasp and her bodyguards, the track "Ship Battle" plays.
- Main article: Widow
Widow is the fifth demon encountered in Shadow Fight 2. As with the other demons, she has five bodyguards named after animals particularly of cold regions, which serves as a metaphor of her cold-heartedness and indifference towards her admirers, though she does seem to hint some genuine feelings for Shadow, as he was unaffected by her charm. Her "bodyguards" are people who were mesmerized by her magic and beauty, competing for her attention, with the exception of Puma, Widow's only female bodyguard who genuinely serves Widow to help her achieve her ambitions.
Widow wields a pair of fans with a leeching effect. Her special ability is that she can teleport behind Shadow and backstab him, doing a noticeable amount of damage. This can be avoided by doing a very well-timed roll, a backwards kick as soon as she teleports, or simply intercepting her before she finished the teleport. Widow hands over the Orange Seal after she is defeated. If defeated once more in eclipse, players will get her weapon as a reward.
During the fights with Widow and her bodyguards, the track "Shadow Lady" plays.
- Main article: Shogun
Shogun was once a servant of the Prince, a man of royal birth. Seeing the incompetence of said Prince, and how his nation was falling to ruins because of this man, Shogun masterminded the assassination of the Prince, without the awareness of his men, and seized power for himself. While the nation was certainly stronger and more powerful than when previously ruled by the Prince, Shogun's reign showed to be tyrannical and somewhat despotic, as hinted by Shogun's bodyguards.
Shogun wields a pair of a katana and a wakizashi blade - the pair of blades is called Daisho. His special ability is that he can call his bodyguards, who will come from either side of the screen at random intervals, one at a time, and attempt to strike Shadow once before "flying" upwards. The summoned bodyguards cannot be attacked. Their attacks cannot be blocked, but can be avoided. Defeating him will reward the player with the last seal, Jade Seal, as well as unlocks Gates of Shadows. If the player defeats him once more during eclipse, they will get his weapon as a reward.
- Main article: Titan (SF2)
Titan wields a huge, two-handed sword called The Desolator. There is a handle attached on its side to aid in its usage, since the weapon is so heavy. Unlike the other bosses, the player will not receive his weapon if he or she beats him again in Eclipse Mode.
When the player fights Titan's bodyguards, the track "Citadel" will play. Titan's bodyguards are battled in a different area than May's (controlled by Titan) and Titan's. Before the player gets to fight Titan, he sends May, who was previously sucked into the Gates of Shadows and possessed by Titan.
During the fight with May, the track"Final Boss" plays.
When the player fights Titan, the track "Epic Titan Battle” plays.
Underworld bosses are the Eternals, powerful beings that have lived for thousands of years. Their domain is the Underworld. They awakened after the Gates of Shadows opened, aiming to destroy the world. To enter a fight with any eternal, special keys are needed. These keys are won by defeating junior Eternals to fight senior ones. A specific amount of players are needed to challenge underworld bosses. Their shield must be destroyed in a specific amount of time that is different for each boss. After that, players can challenge them. If they lose, they can repeat the fight until they win which is called Finishing. Every fight lasts for 45 seconds. A minimum amount of damage has to be dealt by the player to reach the Finishing Round. Keys for Volcano are replenished to 5 at the beginning of each season. All other keys have to be won by the player after defeating Eternals.
- Main article: Volcano
Volcano is the first Eternal encountered in Underworld, the multiplayer mode of Shadow Fight 2. He has hardened magma as his body and fiery flame as his hair. Volcano is one of the four bosses of the first floor. He has the ability to teleport and control fire. Volcano has a shield of 1,757 points which has to be destroyed within 5 minutes and 20 seconds before the players can finish him.
During the fight with Volcano, the "Raids Volcano" music plays.
- Main article: Megalith
Megalith is the second Eternal encountered in Underworld. He is a stone-crystal humanoid being. His dungeon is a mine full of different gems. He has the ability to move earth to cause earthquakes, he has even moved continents. Megalith has a shield of 5,621 points which has to be destroyed within 6 minutes and 40 seconds before the players can finish him.
During the fight with Megalith, the "Raids Megalith" music plays.
- Main article: Fungus
Fungus is the third Eternal encountered in Underworld. He is a giant living mushroom and has power to control mushrooms. He has a shield of 11,098 points which has to be destroyed within 5 minutes and 50 seconds before the players can finish him.
During the fight with Fungus, the "Raids Fungus" music plays.
- Main article: Vortex
Vortex is the last Eternal encountered on the first floor of Underworld. He is a fish-human hybrid, with his humanoid traits being more dominant. He has the ability to summon huge floods. Vortex has a shield of 13,531 points which has to be destroyed within 6 minutes and 30 seconds before the players can finish him. Players need to get Dan 3 before they can challenge Vortex.
During the fights with Vortex, the "Raids Vortex" music plays.
- Main article: Fatum
Fatum is the first Eternal encountered on the second Tier of the Underworld. She has the appearance of a woman with pale skin and yellow eyes. She wears a black hood and gown. Fatum has the ability to see and predict a human's demise, by delivering it directly. She has a shield of 9,171 points, which has to be destroyed within 8 minutes and 30 seconds before the players can finish her. Players must reach Dan 4 to challenge Fatum.
During the fight with Fatum, the "Raids Fatum" music plays.
- Main article: Arkhos
Arkhos is the second Eternal encountered on the Tier 2 of the Underworld. He is a rat-human hybrid, with his humanoid traits being more dominant. He also wears a tattered robe. Arkhos is the leader of rats. He also has gathered followers which he fed with lies. Arkhos has a shield of 9,668 points, which has to be destroyed within 8 minutes and 10 seconds before players can finish him. Players must reach Dan 5 to challenge Arkhos.
During the fight with Arkhos, the "Raids Arkhos" music plays.
- Main article: Hoaxen
Hoaxen is the third and last Eternal encountered on Tier 2 of the Underworld. He is a two-headed humanoid creature, with tentacles on his back. He also has human faces covering his abdoment and one on his shoulder. He has the ability to drive people mad with illusions. Hoaxen has a shield of 11,539 points, which has to be destroyed within 7 minutes and 50 seconds before players can finish him. Players must reach Dan 6 to challenge Hoaxen.
During the fight with Hoaxen, the "Raids Hoaxen", also known as, "Lord of the Lies" music plays.
- Main article: Karcer
Karcer is the first Eternal encountered on the third Tier of the Underworld. He is a ghoul-like creature with fang-like bones protruding from around his neck, a series of bones structure resembling ribcages protruding from his back, and a long tongue with a similar appearance of a worm, complete with small fangs. Just like the usual depiction of ghouls, Karcer is a creature with an infinite hunger. For him, humans are nothing but food. Karcer has a shield of 9,872 points, which has to be destroyed within 5 minutes before the players can finish him. Players must reach Dan 8 before they can challenge him.
During the fight with Karcer, the track "Raid Karcer" plays.
- Main article: Drakaina
Drakaina is the second Eternal encountered on the third tier of the Underworld. She has the appearance of a woman with red skin. Drakaina is a barbaric creature who is filled with rage and thirst for blood and finds delight in shredding her enemies to pieces. Drakaina has a shield of 11,123 points, which has to be destroyed within 7 minutes before players can finish her. Players must reach Dan 9 to challenge Drakaina.
During the fight with Drakaina, the track "Raid Drakaina" plays.
- Main article: Tenebris
Tenebris is the last opponent encountered in the Underworld. He is the ruler of the Underworld and the one who created the Eternals. Tenebris claims to have created the the world, along with its light and darkness, hence him being called Maker, Creator, and Father. He is the one who made the decision to wipe out humanity to purify the world from shadow contagion, in order to cleansing it for new lives. Tenebris has a shield of 17,377 points which needs to be destroyed within 6 minutes before the players can finish him. Players must reach Dan 10 to challenge Tenebris.
During the fight with Tenebris, the track "Raid Tenebris" plays.