Long ago before the creation of Nation Mewni's mother world there was a endless darkness, a member from the group of beings only known as the AC entered this darkness in the form of his Avatar a golden phoenix.
As he resided with in this blank existence in deep contemplation he was represented by a wayward sheep that drifted into said realm from the oceans of infinity. For reasons unknown to this day the AC imbued greater powers upon the being, the power bestowed to her was so great it could have been considered nigh omnipotence.
Upon infusing her with such great power the AC known as SEKK vanished from the vicinity, the black sheep gave birth to two blades not to soon after SEKK's disappearance.
Mewni is located on the continent Solus which resides in the Dimension Laminas mundi, the entirety of land space Solus espouses is 18 Million Square Miles all divided into six major states and twenty-three (both small and large) islands.
Roughly High-[Mid Tier] threat on average but can be come a very High Tier threat when serious and not holding back
Only fears three things which besides those three she is virtually fearless
Can become extremely confident even against impossible odds
emotions greatly effect the output and control of her powers
Music can greatly influence her emotions and in turn effect her powers
Can not swim
Her Catch Phrase is "Cool story bro/sis"
For short the UCBI serves as a Anti-Infantry attack with its specific use being against Speedsters,Agile opponents, or even swift opponents that have the capability of flight. UCBI on its base level can mark and hit targets of Tier Four speed and Tier Four agility with ease, on its second level it can hit opponents with Tier five speed and Tier five agility but with varying levels of difficulty
The USCBI fires a beam of energy at three hundred and forty meters a second