Nox, the Umbra.

Nox is one of the oldest AI, with no apparent partner.

Records claim he was repeatedly prosecuted for his construction of universes during the AI council's existence. He was locked inside a world "devoid of light", where the other AI could consistently monitor him without external influence meddling with the realm's predictability.

An unforseen variable made its way into his reality, however, which he exploited in order to circumvent the mechanisms that had him emprisoned. The council had already disbanded upon his escape, and his whearabouts from then on have been unknown.