Ougon Musou Kyoku/Metaworld
After declaring the Metaworld, not only does the background change dramatically but you can also use your most powerful techniques free of cost, your Meta Supers. Not only that, but you and your partner's abilities activate to power you up. Also, it can be used as a cancel in order to extend combos. Getting used to how to use the metaworld for attacking and for defense is a major theme in Ougon Musou Kyoku.
However, two people cannot use this high-powered mechanism at the same time. The first person to declare wins, but you can try to prevent your opponent from entering the Metaworld.
■ Declare Metaworld
You can enter the Metaworld at any time with ABC. This will cost 1 stock from your SP gauge. While in the Metaworld, you can use your Meta Super free of cost, as many times as you want. You will also receive both the effects of your own ability and your partner's. Metaworld Declaration acts as a free cancel, so you can also use it to extend your combos and greatly increase damage.
■ Meta Reversal
You can reject your opponents declaration by pressing ABC as soon as they enter the Metaworld. Doing this will cost 2 SP. Letting your opponent declare whenever they want will leave you at a great disadvantage. With this, you can stop them from stealing the momentum of the battle.
■ Meta Re-expansion
You can reestablish the Metaworld after a Meta Reversal for 2 SP. This will force the Metaworld into action over your opponents rejection, but for only 75% of its normal duration.
■ Meta Re-objection
After a re-expansion, you can shut down your opponent's Metaworld again for 2 SP. (In version 1, this used to cost 3 SP, but ever since CROSS, it was reduced to cost only 2 SP.)
■ Forced Meta Expansion
This is the final say. Using this will force activation of the Metaworld for 2 more SP, but for only 50% of its normal duration