To Aru Majutsu No Index | Episode 10

However, the episode ends on a dark note. Another clone, , begins a predetermined battle with Accelerator , the strongest esper in Academy City. This fight is revealed to be part of the "Level 6 Shift" experiment, a project aimed at evolving Accelerator into the first Level 6 esper by having him kill 20,000 Misaka clones. Key Character Appearances

: The primary antagonist of this arc, introduced as a ruthless combatant. To Aru Majutsu no Index Episode 10

: This is the first time the audience learns about the "Tree Diagram" calculations and the horrific scale of the experiment. However, the episode ends on a dark note

If you are referring to later seasons, the 10th episodes follow different arcs: Key Character Appearances : The primary antagonist of

: The episode explores the cold, calculated nature of Academy City's higher-ups, who view the clones as mere "disposable equipment" rather than human beings.