|Name||Cross-Dimensional Observation System No. XX|
|Gender||None (programmed as Female)|
|Weapon/Power||Any combat datas she observed and gathered|
|Series||BlazBlue: Cross Tag Battle|
|First Appearance||BlazBlue: Cross Tag Battle|
|First Fighting Game Debut||BlazBlue: Cross Tag Battle|
|Japanese Voice||Mitsuki Nakae|
|English Voice||Carrie Keranen|
|Company||Arc System Works|
The Cross-Dimensional Observation System No. XX, known as System for short, is the main antagonist of BlazBlue: Cross Tag Battle.
According to Rachel Alucard, she was created by her father Clavis Alucard, from the fragments of Keystones, which splits into four to record any combat datas within each four selected universes through establishing a so-called universal Keystone Scramble Tag tournament, like the spy cameras, unaware to the chosen fighters. Originally, Clavis created her for the purpose of cross-dimensional observation and the creation of new possibilities, but gone haywire to start acting sentient on her own. Once all data has been gathered, she began her true conquest to conquer the universes she selected, then so may the rest of the unseen universes. It was revealed by the time Rachel found this abandoned, she accidentally activates System, and must undo her mistake to shut her down before the latter’s universal invasion begins.
If one data collected Keystone from winning universe is destroyed, just as the fighters of the winning universe obtain the piece of their respective Keystone, all other chosen worlds merge into the former said universe, corrupting the fabric of reality, only the inhabitants of the winning universe regain the memories of the previous cause and knowing what happened with their home universe.
Quest to Cooperative EndingEdit
The Cooperative Ending, the 4th ending can only be applied on BlazBlue Episode, after unlocking 3 different BlazBlue endings, and clearing 3 other series episode’s respective endings, giving Ragna the Bloodedge, the warrior whom System summoned in the first place gains an opportunity to trust the heroes of 3 other worlds to keep their respective Keystones and keep in touch with each other, upon realizing something’s not right with the tournament which System’s helding. However, Ragna still shouldn’t trust Hazama Honoka to unlock this route and avoiding to end up marching to the ending involving Hazama’s victory.
Once you have completed following the tips above, Cooperative Ending battle began to occur, where System transformed into her actual final form if all four Keystones are fused after gathering enough battle datas while they were under the hands of four leaders/primary protagonists. The only heroes she brought are Ragna, Yu Narukami, Hyde Kido, Ruby Rose, Rachel, Yosuke Hanamura, Linne, Weiss Schnee, Chie Satonaka and Yukiko Amagi. With the effort by Ragna and three other respective series’ own protagonists, System is finally being destroyed in this state, restoring all four worlds back to normal with no side-effects.
Depending on which series’ episodes, System has 4 main different forms based on her four selected universes. Eg.: If her form is blue, she can only summon the doppelgängers of Blazblue universe’s fighters.
If all datas within four Keystones has been gathered together while they were still under the hands of four leaders of respective universes, System will transform into the 5th final form and be able to summon all doppelgängers of the fighters from four chosen universes.