However, the Immune System’s greatest strength wasn't just its power, but its memory. After the war, a special group called retreated to the city’s library. They archived the blueprints of the defeated enemy. If those specific invaders ever dared to return, the guardians wouldn't need a long battle; they would recognize them instantly and neutralize them before they could even move.

: Operating from the shadows, these units manufactured millions of custom-made "keys" called Antibodies . These keys would lock onto the invaders, paralyzing them and tagging them for the Macrophages to finish off. The Victory and the Library

The alarm reached the High Command in the . From there, two elite units were dispatched: