Sword Art Online: Alicization (dub) Episode 13 -

Cardinal explains her own existence as a sub-process of Quinella that split off when the Administrator attempted to expand her memory capacity by using another person's Fluctlight.

Acting as a mentor and guide, she provides the necessary exposition to help Kirito understand the true nature of their world and the enemy they face. Sword Art Online: Alicization (Dub) Episode 13

They transition from fugitives to active rebels, now armed with the knowledge of how to save Alice and others from the Administrator's control. Cardinal explains her own existence as a sub-process

Cardinal forms an alliance with Kirito and Eugeo. She reveals the truth about the Integrity Knights —that they are not legendary heroes summoned from the heavens but humans whose memories have been stolen and replaced by "Piety Modules". Cardinal forms an alliance with Kirito and Eugeo

Though not present for the primary action, her backstory establishes her as the central antagonist with god-like control over the Underworld.