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Field bosses are powerful enemies that spawn in specific locations in the field. They are open for anyone to participate in; you just have to travel to their location and get a few hits in to ensure you have contributed some damage to the boss in order to get a reward. You will need to stay in the area until the boss is defeated to claim your reward; if the boss dies while you are respawning, you have a short period where you can return to the zone to claim your reward.
Rewards are better the more damage you can contribute; 1st through 15th place get extra items and better reward chests.
Bosses spawn every 6 hours. On JST, this is at midnight, 6am, noon, and 6pm. For bosses in earlier story zones, a different boss spawns on each channel. If you arrive at a zone and the boss is defeated, try checking other channels to see if one is still available to be challenged.
Bosses starting from Atrasian Ruins (Khalia's Phantom) and onward have a single boss spawn which shares HP across all channels. Because only 1 boss is available in these regions, they will reward more boxes per defeat. This currently includes Atrasia (Khalia's Phantom), Boddly Archives (Blue Goddess Statue), Trainia (Zarenforce), Hydropolis (Argos), and Sagartha (Proto Mk-IV), unless a Field Boss Season is in effect for that boss.
You can travel to each boss either by using the world map, or by going through the Field Boss submenu (under the Challenges menu).
Field bosses are a major source of accessories. Bosses can drop the accessories directly, they can be rolled from the reward chest, or you can collect purified soul drops and use 100 of those to forge an accessory in Evermore.
These accessories are acquired as "sealed". You must roll the actual accessory from the sealed version; each sealed accessory has a 90% chance to roll a 3* boss accessory, a 9% chance to roll a 4* boss accessory, and a 1% chance to roll a rare 4* boss accessory.
Note that Cockadraco does not have an associated boss accessory; it drops boxes that roll generic 3* accessories instead.
During a Field Boss Season, you may be able to talk to Tunba to trade-in Field Boss Season drops for both its normal 4* accessory and rare 4* accessory. Note that the rare 4* trade-in requires a normal 4* accessory at awakening 10.
Every week, you can accept up to 5 bounty quests from Jackson in Evermore. To clear these quests, you must help defeat the appropriate boss by the end of the week; you will earn various extra items including purified souls and a sealed accessory for that boss. Clearing 3 bounty quests is also a weekly to-do task.
Usually, bosses spawn as "normal" versions, with stats relative to its map zone. There are also regularly scheduled Field Boss Seasons, which usually last ~6 weeks each. Each season, a specific Field Boss will spawn as "corrupted", being significantly stronger and with much higher HP. Regardless of its map location, the boss will spawn multiple versions, one per channel. The seasonal Field Boss also has better rewards. These can drop directly from the boss, be traded in for with special seasonal drops, or be earned from the season pass.
There is both a free and premium season pass. The system works similar to passes like Dimension Border, but the premium pass costs real money (currently 3,060yen) instead of diamonds. There are rewards up to level 50, which vary by season. Typical rewards include extra seasonal drops for trade-in, ingredients for cooking a special food item that gives you buffs against the seasonal boss, seasonal skill books, boss accessories, or familiars. To level up the pass, you need to complete a variety of missions, which include basic things like 'defeat X field boss Y times' but also missions like 'defeat the seasonal field boss using X familiar' -- so you may need to vary your build for a few fights. Occasionally missions will provide additional rewards, like food ingredients or potions. The premium passes include extra missions for you to clear so you can level up faster, and some of these extra missions include additional rewards like premium magic skill pages. A second set of missions are added in the second half of the season, although the maximum level remains at 50, so don't feel too rushed to complete everything in the first few weeks.
During certain seasons, Tunba also has a new, special accessory forging ability to make 4* and rare 4* of the season pass boss's accessory. This requires a specific number of 1*, 2*, and 3* boss proofs to forge a normal 4*, and these boss proofs plus a normal 4* accessory at 10 awakening for the rare 4*. Other times, a special shop may be available to trade in special boss drops for season-specific items like skill books, familiars, or mounts.
Field Boss Seasons
Season 1 (8/12/2022 - 9/22/2022): Stellia
Tunba trade-ins: accessories
Skill: Flash Wave
Season 2 (10/6/2022 - 11/17/2022): Mechadragon
Tunba trade-ins: accessories
Skill: Shadow Flare
Season 3 (1/6/2023 - 2/16/2023): Cockatracko
Store trade-ins: familiars Balloonatic and Whippersnapper
Skill: Flame Claw
Season 4 (3/16/2023 - 4/27/2023): Giganti
Tunba trade-ins: accessories
Skill: Quantum Tornado
Season 5 (5/10/2023 - 6/22/2023): Vulcan
Tunba trade-ins: accessories
Skill: Frost Cyclone
Season 6 (7/6/2023 - 8/17/2023): Silverbeard
Tunba trade-ins: accessories
Store trade-ins: Silvershroom mount and leveling materials
Season 7 (8/31/2023 - 10/12/2023): Khallia's Phantom
Tunba trade-ins: accessories
Store trade-ins: Little Darkness Guardian mount and leveling materials
Season 8 (10/26/2023 - 12/7/2023): Blue Goddess Statue
Tunba trade-ins: accessories
Store trade-ins: Blue Goddess Hands mount and leveling materials
Season 9 (12/21/2023 - 2/7/2024): Zarenforce
Tunba trade-ins: accessories
Store trade-ins: Prison buggy mount and leveling materials
The listed stats and drops are for the normal version of the boss.
Element: Wood
Level: 18
Location: Southern Heartlands
Fighting Cockadraco:
Cockadraco is a very weak field boss, and apart from its material drop (for the collector book), doesn't have anything unique in its drops. It's fine to fight until you've maxed out the material drops, but once you have, you should move on to the next bosses.
Element: Wood
Level: 47
Location: Serene Forest
Fighting Silverbeard:
Silverbeard has a variety of attacks, including attacking a large area in front of it, throwing up spiky vines on both of its sides, and a series of round sweeping attacks. You should have enough time to move away from the danger zones, although be careful about running back in after the sweeping attack to make sure it has done all 3 attacks in the series first. Every so often it will spawn a set of plants, which are fixed in location, which will attack things nearby. You may want to set Silverbeard as your target to prevent your character from locking onto and attacking these adds. It can summon small whirlwinds which can momentarily freeze your character into place. These plants and whirlwind attacks become more common when it is in low health.
Element: Fire
Level: 64
Location: Ravine of Wind
Fighting Vulcan:
Vulcan has several round ranged AoE attacks. Sometimes it will slam its tail in the ground behind it; sometimes it will jump into the air and slam into the ground beneath it, and sometimes it will leap forward and land on an area in front of it. At low health, it will also do a sweeping fire breath attack in front of it, or launch a fireball in front of it. Approach Vulcan from the sides to avoid both its back and front attacks, and be sure to dodge roll away from the danger zone when it does its big jump attack.
Element: Water
Level: 78
Location: Glittering Grotto
Fighting Giganti:
Several of Giganti's attacks will cause the ground to freeze which can inflict a status effect on your character that continuously lowers your health/reduces your movement speed. Pay attention to the ground and avoid walking on frozen areas. These areas thaw out after several seconds. Giganti has several different attacks in front of it, a series of round sweeping attacks (the series is extended when it is in low health, so be careful running back in), and sometimes it will leap into the air and land on the ground below it. It also has a rush attack, where it will charge in a straight line in front of it for a short distance. When you see this attack's danger zone, it's useful to reposition yourself to near the end of the zone so you can attack it while it recovers from its dash.
Element: Dark
Level: 89
Location: Witches' Woods
Fighting Stellia:
Stellia has a very broad round sweeping attack, an attack where it leaps into the air and lands on the ground below it, and a narrow laser that it shoots out in front of it. It also has a rush attack where it dashes in a straight line for a short distance in front of it. In low health, it has a second broad area attack centered on itself, and a more powerful laser attack that shoots out in front of it.
Because Stellia's field area is hilly, it can be difficult to see where an attack's danger zone is. If it is stuck on a hill, approach with caution until you have a better feel for the range of its attacks. However, it can sometimes get stuck on hills at the edge of its zone, rendering both its laser and rush attacks useless as it will shoot them into the zone edge instead of at players.
Element: Light
Level: 98
Location: Rainbow Valley
Fighting Mechadragon:
Mechadragon is a fairly slow boss but is very powerful. It can shoot a laser in front of it, and has several sweeping attacks around it. The lightning sweep attack can stun your character; the other sweep attack is a series of slashes expanding outward, so be sure to put plenty of distance between you when it starts that attack. It also has a rush attack that can send it barreling down the length of the field. At low health, it can also summon great bolts of lightning which can stun your character, and its sweep attack series is extended.
Element: Dark
Level: 127
Location: Atrasia Castle
Fighting Khallia's Phantom:
Khallia's Phantom is a large dragon with numerous dangerous attacks.
Curls around on itself: it will summon a trio of dark orbs that spin around it and will do damage to you. After a short while, the orbs will disappear, usually Khariya will then leap into the air and land, targeting a large circular area beneath it.
Sits back on its haunches: summons several large lightning bolts in random locations
Hit and slash: slams its left and right forelegs down and then does a sweeping slash in front of it
Jumping slash: moves back slightly, then launches itself forward and does a slash attack
Roar attack: Does damage in a large circular area around it, and inflicts confusion
Siphon attack: Sucks in anything in a large circular area in front of it, then does a large hit of dark damage to anything that got caught in it.
Element: Water
Level: 148
Location: Boddly Archives
Fighting Blue Goddess Statue:
The Blue Goddess Statue tends to summon water orbs and also has several powerful slash attacks.
Rush attack: slash attack in a large column ahead of it
Ring of water attack: Summons a ring of water around it, the second half does a circle of water damage around it
Circular water attack: Sumons a circle of water damage in front of it
Water orbs spoke attack: Summons water orbs in radiating spokes around it, then shoots them back out. It will sink into a pool of water, so if you position yourself between the spokes you can get a few good hits off safely
Whirlpool attack: Summons multiple whirlpools of water in circular areas nearby it
Water orbs attack: Summons multiple small orbs of water in random locations nearby it. You can get caught in the orb if you get too close and you will be unable to attack for a short time
Element: Wood
Level: 175
Location: Treynia
Fighting Zarenforce:
Zarenforce has generally slow, well telegraphed attacks with wide, sweeping motions. He also drops large swords from the sky. You need to pay attention to their damage zones to make sure you can dodge out of the way in time.
Swing attack 1: Swings in a large fan area in front of him, then spins around and does a long column of damage behind him.
Swing attack 2: Swings in a large fan area in front of him which draws in players, then does a second swing in the same zone.
Dropped sword attack 1: Swings in a full circle around him several times, which draws in players, and may trap them in cages. On the last swing, he will also drop a large number of swords around the edges of the circle.
Dropped sword attack 2: swings in a full circle around them and summons several green mist circles. These circles move around the field slowly, and when they stop, each circle will be pounded with swords dropped from the sky.
Single and Triple front hits: Does either a large slam in a circular area in front of him, or 3 smaller slams in a sequence in front of him. After the 3-hit version, he'll follow up with a sweep attack.
At low health, Zarenforce also gains the the following attacks:
Summons an orb that spins around him for several revolutions: once the orb is spinning, he will continue to do his other telegraphed attacks so you will need to dodge both.
Summons darkness mists: Summons several pools of dark mists onto the field, and then spins out large orbs in columns in front of him. If you stand in a mist for too long you will get confused; however, at the end of the pattern he will do a powerful AOE attack that hits the entire field, and the only way to dodge this is to have a barrier that absorbs hits (i.e. from molten lion) or to hide in the mist until the attack is clear.
Element: Light
Level: 200
Location: Hydropolis
Fighting Argos:
Argos is a large fish monster that uses numerous lightning attacks, which can stun or silence you. At certain times, it will dive under the sand and you will need to wait for it to reappear before you can attack it.
Dash attack: Argos swims and slashes its fins in a narrow area directly in front/behind it
Tail fin attack: Argos sweeps its tail back and forth in a fan area behind it
Circular swim attack: Argos swims in a tight circle, doing damage in a small circle around it
Lightning summon attack 1: Argos summons 3 bolts of lightning to its left, right, and directly in front of it. These bolts can silence you.
Lightning summon attack 2: Argos can summon bolts of lightning at random points on the field, which have a medium AOE and can silence you.
Radial light spear attack: Argos will send spears of light at many points radially outward in 2 waves.
Sand dive attack: Argos will dive into the sand and be temporarily invisible/invulnerable. Lightning will strike the field at random locations. A brief while later, it will surface and do a damage in a large circular AOE
At low health, Argos also gains the the following attacks:
Radiating waves of light attack: Argos will summon rings of lightning that radiate outward from its location. With good timing, you can dodge roll towards Argos between waves and avoid damage; otherwise just flee to the edge of the field until this completes
Radiating orbs attack: Argos will summon orbs and radiate them outwards. If you are struck by one, you will be stunned and it will usually follow up the attack by summoning a lightning bolt at your location
Element: Dark
Level: 230
Location: Sagartha
Fighting Proto Mk-IV:
Proto Mk-IV is a fairly mobile boss but spawns on a fairly small platform. It can rush down players directly or summon a variety of cubes to attack players either nearby it or at various areas on the field. Numerous attacks by Proto-MkXIII can stun you, so be careful about going in for an attack if you can see it winding up for a big attack of its own. Some of cube AOE attacks come in waves, so be sure to dodge the full set of them.
At certain points, it will also spawn a couple of smaller Proto Mk mechs to harry players. While it is not necessary to defeat the smaller mechs, they will clutter the field significantly with extra attacks and targets until they are destroyed.