| Big Core MK-IV |
|Romaji||Biggu Koā Māku Fō|
|Type(s)||[ Machine/Fusion/Effect ]|
|ATK / DEF||3100 / 2900|
Lore"Big Core MK-III" + 2 " " monsters
(This card is always treated as a "B.E.S." card.)
Must first be Fusion Summoned with the above Fusion Materials. If this card is Fusion Summoned: Place the s of the materials used for its Summon on this card. Cannot be destroyed by battle. At the end of the Damage Step, if this card battled: Remove 1 counter from this card. If you cannot, destroy it. If this card would be destroyed by a card effect, except its own, you can remove 2 counters from it instead. You cannot use this card's unused adjacent zones. This card can only attack monsters in its column and its adjacent columns. Once per turn: You can remove 1 counter from this card; destroy up to 2 monsters your opponent controls, also monsters you control cannot declare an attack for the rest of this turn.