Male HP: 3.5m Mana Core Level: 25 "None return alive. Prepare for your time." He is the boss located in the Ruined Labyrinth. Target level for capture: 65~70. He wears a black cursed helmet, a scarf, and gray armor, with a red, dead glow in his eyes. He uses a cursed sword as his weapon. Ability: Curse He attacks with swordsmanship, and every hit inflicts a curse. Personality: Nihilistic and appears lonely.

Male HP: 5m Mana Core Level: 35 The powerful headquarters that rules Luna Ark. He resides in Luna Castle, the imperial palace within Luna Ark. Target level for capture: 70~80. He wears a helmet with black goat horns and black plate armor, and has red pupils. Weapons: Heavenly Destruction Hammer and Stone Shield. Abilities: Whirlwind Decapitation, Ground Crash, Annihilation Flash. Personality: Extremely arrogant. He considers Guest to be a low-class commoner.

Male HP: 15m Mana Core Level: 50 The Withered Branch of the Frozen Valley within the Moonlight Hall of "Nothingness" from the ancient Twilight. He is the boss in the Cheongak Hall, deep within Paradise. Target level for capture: 80~85. He has pink hair, pale pink eyes, and wears a blue Paradise-style martial arts uniform. Weapon: Cherry Blossom Katana. Abilities: Continuous Petal Slash, Blossom Flash, Falling Flower Slash. Personality: Loves fighting and is intoxicated by his own leisure.

Female HP: 30m Mana Core Level: 50 The central region of Frostia. She stands in the Watchtower Fortress inside Frostia. Target level for capture: 85~90. She has long mint-colored hair, a halo above her head, black eyes, and a pair of ice shard wings on her back. Her outfit is a navy blue uniform. Weapon: An ice bow called the Glacial Bow. Abilities: Ice Pick, Ice Boom. Personality: Has great pride and hates being ignored most of all. She hides her emotions behind a sly demeanor.

Male HP: 51m Mana Core Level: 50 A dangerous place that extinguishes even the warmest embers. He is in the collapsed ruins guarding the Winter Castle at the very edge of Frostia. Target level for capture: 90~100. He is a knight full of chivalry who is loyal to Sia, the Queen of the Winter Castle. However, Sia never leaves the Winter Castle. Appearance: Wears a black helmet and black armor, with a blue magic circle on his back. It features geometric patterns. He uses a sword called the Breaker of Sudden Death. Abilities: Sword Aura, Wind-Absorbing Moon Slash, Single Point Concentration.

Male HP: 350m Mana Core Level: 85 "The Abyss Order shall never be corrupted." The boss of the 2nd Gate of Atlantis. Target level for capture: 105~107. He wears rusted abyss armor and a helmet, and has 6 transparent blue tentacles, which are an aggregate of Owen, on his back. He uses an anchor. Abilities: Torrent, Crushing Bind, Heaven-Sinking Anchor. Personality: Reticent.

Male HP: 600m Mana Core Level: 100 God of the Sea, Storms, and Earthquakes—one of the three Great Gods. He is the boss of the 3rd Gate of Atlantis. Target level for capture: 107~112. He has white hair, wears thin Atlantis-style armor and various accessories, and holds a weapon called the Abyssal Pulse. Abilities: Torrent, Thousand Water Spears, Pier Rise, Storm, Thunderbolt. Personality: Cheerful, full of confidence, and welcomes challenges.

Male HP: 955m Mana Core Level: 115 The deepest part of the cave, a grand underground finale where all memories vanish and turn into mist. He is the final boss appearing in Oblivion. He has a blue body, six arms with chains, a core in the center of his body, and a white magic circle on his back. Weapons: Two floating, sharp black-and-white hands that he controls. Abilities: Execution, Fist Summon, Mana Core Suppression, Chains. Personality: Unknown.

Male HP: 125m Mana Core Level: 80 "I look delicious, but I am an undersea hunter." He is the boss of the 1st Gate of Atlantis. Target level for capture: 100~105. He is a hybrid of a crawfish and a lobster; he is tall, has four legs, and two pincer arms. Abilities: Shockwave, Pulse, Scream. The scream is a "Skreeee!!" sound that locks skills for a few seconds. Personality: Simple. Crawfish-level intelligence.

Male HP: 1.5m Mana Core Level: 15 "Waterfalls are culled between giant cliffs." He is the boss in the Land of Great Evil. Target level for capture: 55~65. He wears navy blue armor and a black helmet. He uses a black and red greatsword called Dark Fire. His abilities include Single Point Concentration and a simple Side Swipe. Personality: Arrogant and serves Hallucination with total sincerity. He considers Guest to be a low-class commoner.