MK-X

The MK-X (MarK-X) series of bosses based on the Square. This is the first X-K-X boss, surpassing even EK-X and TK-X. Originally, it was named MK1 and was added on October 7, 2018. MK-2 and MK-3 tiers were added the same day. MK-4 was added later on the same day, four hours later, and the tier system was renamed to MK-X one hour later. MK-5 was added on July 15, 2018, and was heavily nerfed the same day. Originally, it had six minions of both types, but now it has only three minions of both types.

MK-X series is mainly based on swarm drones and all have a square yellow base. MK-1 is even weaker than EK-1, but all higher tiers are more based on swarm drones. Minions are also a pretty important part of the MK-X boss. MK-5 is based on bullets, swarm drones, and minions. MK-2, MK-3, and MK-4 are more based on drones/swarm drones. MK-4 is mostly based on swarm drones, as they are very strong. Also, MK-3 has a Hybrid auto-turret, which is obtained only by a few other bosses like C.L.O.C.K. or Destroyer.

MK-X cannot currently spawn in the game under any circumstances and is on the TESTBED bosses branch. The two highest tiers are blatantly OP, and MK-5 can cause some lag to the server because of its bullets, size, and minions.

Tiers
MK-1=

Design
MK-1 has a yellow square base with two turrets in front supported by a trapezoidal base and an auto-Assassin turret on top.

Technical
MK-1 has low health and speed. Its auto-turret has a low rate of fire and bullet health, but decent damage. Its bullets have a decent penetration and high damage and are fired at a fast rate.

Countering
MK-1 may seem easy to fight, but still, you must be careful. As a bullet spammer, you will likely face no problems in killing MK-1, as you have more firepower. Still, the boss may out-gun you if you will not dodge, so you should also move in a left-right pattern to make sure MK-1 will miss more. As a tank with a long range and low rate of fire, try to keep a longer distance and wait until the boss will be distracted.

As a drone user, you have a slightly different strategy. As a drone user, wait until you have a maximum number of drones, and then charge them at MK-1 when it will be distracted. As a minion user, you can use either strategy. Be wary of other players around, though. MK-1 can easily eliminate you with its high damage if another player attacks you. Eliminate the player first, then come back to killing MK-1. Do not be afraid to ram into MK-1 if it is low on health, but never try to ram it if it is locked on you.
 * -|MK-2=

Design
MK-2 has a yellow square base with a large Nailgun turret in front, and two Sounder barrels on each side. On top, it has an auto-Hybrid turret and two Assassin auto-turrets behind it.

Technical
MK-2 has a medium health and low speed. Its hybrid drones will only lock on the player if he will come close, and have low range. However, these drones are surprisingly strong, have high health and damage. Swarm drones have low health and speed, but high damage. Assassin turrets have a high bullet speed and damage, but low penetration. Bullets of the front turret have medium speed, but no spread and high penetration along with high damage.

Countering
MK-2 has pretty high firepower which can hold off many tanks, and its swarm drones will be easily able to kill you. It is challenging to counter MK-2, as you will not usually be able to kill it before it will kill you. Whenever you this boss, it is advised to run as usually you will not stand many chances against it. If you are skilled, however, you may consider using these strategies.

Firstly, the Engineer branch is pretty effective if you are skilled enough, as bullets from pillboxes will eliminate swarm drones. You should upgrade your movement speed a lot so you can dodge all of the bullets, as well as block health. Some bullets will be dealing low damage to the boss, and you will eventually kill it. Splitter can also be very effective against MK-2, as you can dodge and eliminate swarm drones, as well as deal very high damage. Fighting in teams is by far the most efficient way of killing MK-2, as one player will distract the boss, while others will be killing it. Dodging in a left-right pattern, in either case, is important and vital to defeating the boss.
 * -|MK-3=

Design
MK-3 has a yellow square base with a large Artillery auto-turret on top, a Trapper auto-turret behind it, and two Director auto-turrets to the sides of the artillery turret. In front of its base, MK-3 has two Minigun turrets near edges and two Streamliner turrets between them. At the back of its base, MK-3 has two Underseer barrels.

Technical
MK-3 has a low speed and normal health, and very high firepower. Streamliner and minigun barrels have decent bullet speed and damage, as well as high penetration. MK-3's artillery turret has a high rate of fire, damage, and penetration. Drones of MK-3 have decent speed, high health, penetration, and damage. MK-3 also spawns medium-strength underseer drones, but they are spawned at a very low rate and do not help the boss much. Traps of MK-3 have high speed and damage, but low health. MK-3 also spawns four Square Twins, which add up a lot of firepowers, swarm drones and are the main strength of the boss.

Countering
MK-3 has very high firepower and can easily penetrate any normal tank. Furthermore, MK-3 has very strong drones that can also easily eliminate any tank and four minions that have more firepower than this boss and are respawned immediately after dying. Small groups of players will not stand chance against MK-3, so if you ever see this boss, you have only one option - 'RUN. 'If Square Twin is chasing you, visit its respective section to understand how to handle it.

Killing MK-3 is very hard since it will require your team to be very coordinated. Drones and swarm drones are the largest problems since they will likely eliminate most tanks before the boss will be defeated. Firstly, you should get at least four Hexa Builders in the same team, which should keep themselves close. They will eliminate all minions, drones, providing a much-needed diversion. Secondly, you should get two tanks with a lower danger value, ideally Twinceptionists, which will deal damage to the boss. At least two such tanks are needed, and they should keep a distance from the boss. If everything is done right, MK-3 will fall as it will not be able to defend itself.
 * -|MK-4=

Design
MK-4 has a yellow square base with a unique auto-turret on top. This auto-turret has a yellow base with four slanted bases around it. In front of each such slanted base, MK-4 has a smaller Quintuplet turret. In corners of its base, MK-4 has four Sounder auto-turrets, and four Frigate auto-turrets between them. On corners of its outside base, MK-4 has four Barricade auto-turrets. On each side of its outside base, MK-4 has two Spawners and a Constructor turret between them.

Technical
MK-4 has a low movement speed and high health, higher than most normal bosses. Its quintuplet bullets are strong, have high health and penetration, decent speed, and cover a wide area. Its constructor turrets launch very strong blocks at a low rate, which have high health and lethal damage. Its traps are fired at a fast rate, but have medium-range and health, but still nearly lethal damage. All swarm drones have a high speed and damage, as well as decent health for a swarm drone. Frigate swarm drones have more health and damage, but lower movement speed. MK-4 also spawns 8 minions, which have a yellow color and a single Basic turret in front. These minions have a high speed and high combined DPS, but low health. Four such minions are respawned every 2 seconds. MK-4 also spawns three Auto Squares, which respawn immediately after dying.

Countering
Killing MK-4 is a major challenge, far harder than killing MK-3 or any other normal boss. MK-4 can perish any tank at most ranges with help of its minions in a matter of seconds. Due to the heavily increased amount of swarm drones compared to MK-3 and far more dangerous minions of both types, it will be incredibly difficult to defeat this boss. If you ever see MK-4 or any of its minions, you have only one option - 'RUN. 'If basic minions are chasing you, eliminate them one by one. If Auto Square is chasing you, refer to its respective section to understand how to handle it.

It will be very tough to defeat MK-4, as it has high health and you will not be able to come close enough to kill it. Combatting it will require your team to be very coordinated, using right tanks and strategy. Firstly, you should get a Jump Smasher to distract all the minions from the boss itself, or otherwise you stand little chances. This player should not lure minions too far away from the boss, so they wil always be locked on the player. While minions are distracted, MK-4 will be more vulnerable to account. Swarm drones are still a major concern, so getting two Hexa Blasters in the same team will be helpful to eliminate them and survive onslaught of the boss. Finally, you will need a tank with high penetration, like Redistributor, and at least two tanks with high RoF, like Machceptionists, to eliminate traps and bullets of the boss. Do not hit through the blocks, as you will waste too much time trying to penetrate them. If pulled off correctly, you will be able to kill MK-4 effectively. VPN just does not stand a chance since it will not be able to penetrate its minions which will circle around the boss.
 * -|MK-5=

Minions
Square Twin=

Design
Square Twin has a yellow square base with four Twin auto-turrets on top and two Frigate barrels on sides.

Technical
Square Twin has somewhat low movement speed and mediocre firepower. Its bullets are fired at a fast rate but have medium damage and penetration. Swarm drones it spawns are strong, have medium speed but high damage, and decent health.

Countering
Square Twin will respawn immediately after you kill it, so there is no sense in fighting it. Furthermore, it can be dangerous and comes in a number of four. As such, whenever you see a Square Twin it is advised to run. Try to dodge slow swarm drones, while shooting them to avoid taking damage. If you are forced to defend against a single such minion, you should charge at it. It has low health, so you will likely kill it before it will kill you. Never attack multiple Square Twins, as they will shred you before your tank will kill either of them. Also, never stay at a long range as that's where the swarm drones of the Square Twin are strongest. Smasher branch is not suggested, as you will take nearly lethal damage and likely die if Square Twin shoots at you.

In order to understand how to handle this minion if there is also a living MK-3 around it, refer to its respective boss section.
 * -|Auto Square=

Design
Auto Square has a unique auto-turret on top, which is called Weird Assassin, has an Assassin turret as a base, and two more very short stacked turrets in front of it. In front, Auto Square has a Ranger turret, machine thruster at back, and two auto-turrets on each side.

Technical
Auto Square has a decent movement speed and low health, as well as decent penetration. Its ranger turret and weird assassin turrets have a strong penetration but mediocre rate of fire. Auto-turrets have medium bullet health and penetration, but a far higher rate of fire. Auto Square's thruster bullets deal little to no damage, and only propel Auto Square forward.

Countering
Auto Square will respawn immediately after you kill it, so there is no sense in fighting it. Furthermore, it can be dangerous and comes in a number of three and has a high speed. It is advised to run away as fast as possible if there are two or more Auto Squares, but you can handle a single one. In order to do so, you should use a tank with high-to-medium movement speed, and high DPS. You should move in a left-right pattern while retreating to trick Auto Square into missing more. In the meanwhile, you should deal heavy damage to the boss, and it should die fast. Be vary of weird assassin turret, as it has high damage and you must avoid those bullets.

In order to understand how to handle this minion if there is also a living MK-4 around it, refer to its respective boss section.
 * -|MK-5 Mega Minion 1=


 * -|MK-5 Mega Minion 2=