It's not known how long Oniro held the title of Grandmaster except that he was present before the order was given to automate their ninja assassins. He was present when both Cyrax and Sektor went through the cybernetic process at which point both Sub-Zero and Smoke refused to take part in. The two friends attempted to escape the Lin Kuei but only Sub-Zero managed to escape while Oniro captured Smoke and forced him to undergo the cybernetic process.