Self-Modification [EX]
A skill that allows one to restructure oneself. AIs created by the Moon Cell are under an absolute rule, "Improving one's functionality is not allowed."
However, BB, who had escaped that yoke due to her breaking down, began to expand her own functions. In order to boost her calculating power, she had that black noise prey on and dismantle NPCs, AIs, and finally, Servants, then used them as her own memory.
Though they are appendix-like additions that won't spare her from the fate of collapsing on her own, BB has changed into a hyper level AI who holds an enormous amount of capacity. That condition resembles cities on reclaimed land that continue to build while submerging or Frankenstein's monster.