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"Crystal Core", "Big Core" and "Tetran" in the artwork of "Boss Rush"
"Crystal Core", "Big Core" and "Tetran" in the artwork of "Boss Rush"
  • きょだいせんかん
  • 巨大戦艦 (base)
  • きょだいせんかん (ruby)
  • Kyodai Senkan (romanized)
  • Giant Battleship (translated)

  • B.E.S.

  • B.E.S.

  • B.E.S.

  • 거대전함
  • 巨大戰艦 (Hanja)
  • Geodaejeonham (romanized)
  • Giant Battleship (translated)

  • B.E.S.

  • B.E.S.


TCG Sets

OCG Sets


Anime appearances

"B.E.S.", short for "Bacterian Empire Ship" as well as known as "Giant Battleship" (きょだいせんせん Kyodai Senkan) in the OCG, is an archetype of Machine monsters based on the bosses of the Gradius series. They were used by Lorenzo in the Yu-Gi-Oh! GX anime, as well as by Nathan in the Yu-Gi-Oh! Tag Force games.

"B.E.S. Big Core" was previously known simply as "Big Core", and since "Boss Rush" hasn't been reprinted since "Big Core"'s name was changed, "Boss Rush" specifically mentions "Big Core" as well as B.E.S. monsters.


B.E.S. Origin
Assault Core Big Core
Blaster Cannon Core Blaster Cannon Core
Big Core Big Core MK I
Big Core MK-2 Big Core MK II
Big Core MK-3 Big Core MK III
Covered Core Covered Core
Crystal Core Crystal Core
Tetran Tetran


Card Origin
B.E.F. Zelos Zelos Barrier / Zelos Force
Boss Rush Boss Rush

Playing style[edit]

The main strategy of any "B.E.S." Deck is using the effects of "Boss Rush" and "B.E.F. Zelos" to Special Summon "B.E.S." monsters as beatsticks and overwhelm the opponent with a destruction-proof force of battleships.

All of the "B.E.S." monsters share the same gimmick: they enter the field with counters on them. They cannot be destroyed in battle; instead they lose one of their counters at the end of the Damage Step whenever they battle, and will only be destroyed if they have none to remove. In addition to this, all "B.E.S." monsters are Level 5 or higher, so they rely on being Tribute or Special Summoned.

"B.E.F. Zelos", aside from being of paramount importance for any sort of plays this Deck tries to achieve due to the plethora of effects it grants, is also the number one card to start the game with. Since it searches "Boss Rush", it allows the player to set up a rather ideal board in your first turn consistently. Both "Terraforming" and "Planet Pathfinder" can help fetch "B.E.F. Zelos" and one should consider playing them at max capacity.

"Boss Rush" is part two of the standard "B.E.S." board. For the drawback of locking you out of Normal Summons (including requiring the player to not have Normal Summoned before activation, which can conflict with the aforementioned "Planet Pathfinder"), it fetches "B.E.S." monsters from the Deck during the End Phase in case any was destroyed during the turn. Note that multiple copies of "Boss Rush" can simultaneously search and Special Summon "B.E.S." monsters. However, "Boss Rush" is not only a recovery tool: the player can use "Dark Hole" or "Interrupted Kaiju Slumber" to clear the field, then proceed to Summon back reinforcements during the End Phase. Furthermore, "Limiter Removal" also triggers "Boss Rush" while transforming the battleships into a deadly force during the Battle Phase.

One detail that a "B.E.S." player should be aware of is how the monsters actually acquire their counters: the newer monsters (namely "B.E.S. Big Core MK-2", "B.E.S. Big Core MK-3", and "B.E.S. Blaster Cannon Core") get 3 counters upon being Special Summoned; the rest of the monsters only get counters upon Normal Summon, which means they will enter the field with no counters if Summoned via "Boss Rush" (unless "B.E.F. Zelos" is also on the field, in which case they get 1 counter).

Recommended cards


  • This archetype relies on Special Summoning, so cards like "Fossil Dyna Pachycephalo" will cripple the deck significantly.
  • As mentioned before, B.E.S. is incredibly reliant on "B.E.F. Zelos", so any card negating or destroying it will hinder the deck.
  • Cards like "Acid Rain", "Magnetic Mosquito", and "System Down" have the potential to shut down the deck completely, since the archetype consists entirely of machines.
  • Also, since they are Machine Monsters, they can also be used as Fusion Materials for an opponent's "Chimeratech Fortress Dragon".