Being a strict believer of Darth Bane’s ideology, Darth Cognus did inherit a student of her own named Darth Millennial. He was also a psychic being, just like Cognus, which many believe is the main reason why Cognus chose him to be her apprentice. But unfortunately for Cognus, some time into his training, he challenged the same ideals Cognus followed so strictly, and thus, she banished him from her apprenticeship.