The Steel Meridian is one of the 6 main syndicates, led by a female Grineer defector identified as Cressa Tal. Comprised of ex-Grineer forces born with a genetic flaw that enables them to disobey the Grineer Queens, its goal is to protect and defend what their brothers and sisters would seek to destroy. They seek to undermine the entrenched beliefs of their race and weaken the Grineer's hold in the Origin System by liberating and defending human colonies, although it is unknown whether they are doing this just because of their intense desire to defy their masters or for some form of greater good. Although they are separate from the Grineer, Steel Meridian continues to use of most of their Grineer technology and weaponry, as seen in their Vaykor weapon set and weapon augments.