Neer existed as a Sith Lord before the cataclysmic event known as the Cron Supernova. He secretly created a gauntlet and sent it as an uncredited present to a strong Jedi who was the Jedi Watchman guarding the Corbos system. This Jedi had experienced loss of comrades in battles against the Sith, and upon receiving the gauntlet, he immediately recognized its strength.
The Jedi was ultimately consumed by the gauntlet's influence, and he rapidly started killing individuals for even minor perceived wrongdoings. Ultimately, his Jedi allies were compelled to destroy him, and they transported Neer's gauntlet to Ossus for secure storage, where it was subsequently lost following the Cron Supernova.
The initial mention of Neer occurred within the new Star Wars canon in Nexus of Power, a 2016 sourcebook by Fantasy Flight Games designed as a supplement for the Star Wars Forces of Destiny roleplaying game.