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Activating... Activating... Activating... CROSS System Activation, confirmed. Beginning Multidimensional Observation.
~ System No. XX at the beginning of the game.
Ladies and gentlemen! People of every place and time! People of the physical, the metaphysical and everything in between! Thank you all so much for waiting! Let the 37th Keystone Scramble Tag Battle Tournament COMMENCE!!!
~ System No. XX right before beginning the Cross Tag Battle tournament.

System No. XX is the main antagonist and final boss of BlazBlue: Cross Tag Battle. It is a machine originally designed by Clavis Alucard to create new possibilities. However, a flaw in its design led to the machine invading the worlds it observed and using them as power bases. To prevent the machine from destroying worlds to create new ones, Clavis sealed the System away using the Keystones of the four selected universes (BlazBlue, Persona 4: Arena, Under Night In-Birth and RWBY).

However, the seal on System No. XX was accidentally undone by Clavis Alucard's daughter, Rachel Alucard, leading to the machine summoning warriors from the four selected worlds and having them fight in Tag Battles in the "Keystone Tag Battle Tournament" inside the Phantom Field, telling them lies as they need to collect the 4 Keystones in order to escape and go back home to their universes.

She is voiced by Carrie Keranen.


There are multiple endings, depending on which Episode the player chooses.

Episode BlazBlue

Episode BlazBlue has three separate endings, depending on what choices the player makes in the last few scenes of the story. If the player picks Noel as his partner in the fight against System, then after being returned to his world, Ragna will leave Noel in a field to be picked up by Makoto Nanaya. If the player chooses Rachel, then System will be sealed away after its defeat by Es with the other Keystones. However, if the player chooses to trust Hazama earlier in the game, then he will swoop in and claim the Keystone, plotting to cause all sorts of mayhem with it.

Episode Persona

In Episode Persona, after System's defeat the Investigation Team returns to Yasogami High, only for it to be revealed to be another world created by System, with Ragna, Noel, Hyde and Ruby appearing as transfer students.

Episode Under Night

After System's defeat, the entire cast winds up trapped in the Under Night In-Birth universe during a Hollow Night. A restored System uses this as a chance to initiate a free-for-all battle royale, causing Linne to realize they need to repeat the whole thing over again.

Episode RWBY

After being defeated, System is sealed inside the RWBY Keystone. Team RWBY then returns to Beacon with the Keystone, planning to keep System as a pet.

True Ending/Cooperative Ending

In the true ending of the game called the "Cooperative Ending", System is defeated by Ragna, Yu, Hyde and Ruby, now powered by all 4 data collected Keystones. After the 4 heroes celebrate their victory with the rest of the cast, their universes are restored to their original states and they all returned back to their universes.



           RWBY.png Villains

Salem's Faction
SalemArthur WattsTyrian CallowsCinder FallHazel RainartMercury BlackLeonardo Lionheart

Cinder's Faction
Cinder FallRoman Torchwick (Manga)Mercury BlackEmerald SustraiNeopolitan

White Fang
Adam TaurusSienna KhanWhite Fang LieutenantCorsac and Fennec AlbainIlia AmitolaYumaTrifaPerryDeeryWhite Fang Associate

Xiong Family
Hei Xiong Sr.Junior XiongMalachite SistersJunior's HenchmenDJ

Branwen Tribe
Raven BranwenVernalShay D. Mann

Schnee Dust Company
Jacques SchneeSecretaryArma Gigas

Kingdom of Atlas
James IronwoodAce Operatives (Clover EbiHarriet BreeVine ZekiElm EderneMarrow Amin) • Caroline Cordovin

Happy Huntresses
Robyn HillFiona ThymeJoanna GreenleafMay Marigold

Merlot Industries
Dr. MerlotAndroidsMutant BeowolvesMutant CreepsMutant Death Stalker

The Crown
Jax AsturiasGillian AsturiasRosa SchweinArgento PocoronCarmine EscladosBertilak CeladonUmber GorgoneionGreen

The Spiders
Little Miss Malachite

Creatures of Grimm
ApathyArma GigasBeetleBeowolvesBeringelsBerserkerBlind WormsBoarbatusksCapivarasCenitaurCentinelsChillCreepsDeath StalkersDrakesDromedonsGeistsGoliathsGriffonsHorse GrimmThe HoundImpsJackalopesKing TaijituLancersLeviathanManticoresMegoliathsMonstraNevermoreNuckelaveeRavagersRazorwingsSabyrsSea FeilongSeersShadow HandsSphinxesSpider GrimmSulfur FishTempestsTentacle GrimmTeryxesUrsaiWyvernZiraphs

God of DarknessTeam CRDL (Cardin Winchester) • Marcus BlackTockMadameMadame's DaughtersSystem No. XXJimmy VanilleCarmel Vanille

RWBY Chibi
Cinder FallEmerald SustraiMercury BlackRoman TorchwickNeopolitanTrouble ClefFloyd the GeistMike and MartyCardin Winchester