In Dx2 Battle Tournaments, you fight in a round-robin format during the placement matches and rounds, after which a tournament format will be used in representative tourneys in order to determine the champion.
Challenges are unlocked from the entry period of Round 2 onwards. You can pit your party against parties of other event participants, with opponents selected from a block in an area that you are not assigned to.
If you change your party when using Challenge, it will not change the party you have entered into the Tournament, so you can customize your party to suit your specific opponent.
Wins/Losses Challenges will not affect your results in Dx2 Battle Tournament, and are purely there for missions and to have fun.
Demon Rentals allow you to use certain premade Demons to fill your parties for both the main Tournament Rounds and Challenges.
This is good for newbies who usually do not have enough properly built demons to fill all slots.
You cannot change the brands, archetype, or transferable skills of rental demons, nor can you perform infusions on them.
One wave can have a maximum of 4 rental demons added to it.
Note that the rental Morrighan has MATK% primaries instead of PATK, which she actually uses as her attacking stat, meaning she is severely gimped in terms of damage.
Allowed Waves: 1
During the Placement Matches, players will be sorted into different Areas based on their performance. Then, until the Area Representative Tourneys conclude, you will be fight against players in the same area.
Allowed Waves: Varies
During Rounds 1-4, players within an area will be assigned to blocks. In order to advance through a round, you must be at or above a certain rank within your block. The rank needed to make it out of a block will change with each round.
The number of people in the block is fixed depending on the phase, 100 people in the Placement Matches and 50 people in Rounds 1-3.
The number of blocks in Round 4 changes depending on the number of Dx2 Battle Tournament participants.
Allowed Waves: 3
During the Representative Match, 16 competitors in an area who have made it through the rounds will fight each other in a tournament. The player who comes out on top will be able to enter the Championship Match as a Representative for their area.
Allowed Waves: 3
The Championship Match is a tournament where the number one player from each area will compete. The player who comes out on top in this competition will be crowned Champion.