Nexus was team of consisting of future members of Genesis. They where either unique or reincarnated beings chosen to take part in one of the wars. Although they where a group of adolescents they had extraordinary powers making them as a powerful as somebody from the Third Order.
The team was introduced in the beginning of MG: The End Part 2 as a rival group transferred from a mysterious institution to challenge all members of the MG Academy. It was later revealed that they were in league with the Dark Knights and where sent on a mission to analyze the Chosen Ones. After the Genesis-Resistance War was initiated they were only active within the series training.