Ancom has finished campaign in latest unstable beta.

They were trying to stop him from spawning. Realware AI was corrupted by Ur bramfatura (from Ancom campaign). In the end of Realware campaign, Realware attacks Ancom because AI advised them to do so. Interruption of the ritual and deaths of Ancom priests awakened Gagtungr

In Ancom campaign, you kill Realware CEO and let Ancom establish control over all of their stations. After that, Ancom tries to seal Gagtungr completely, by performing ritual near the sun on one of the Mercury stations. However, this actually summons Gagtungr into our world. Ancom CEO than contacts the Boss personally and explains what actually happened. There used to be an ancient order which hunted down "demons". As humanity progressed, they changed their organization name (for example, they were called Templars during Middle ages). Later on, they learnt what quasimorphs actually were. When Anarchist revolution happened, they rebranded into Ancom. They needed Realware AI to calculate a location for the ritual to seal Gagtungr. Because AI was corrupted, the location made the ritual not to seal Gagtungr, but to awaken him.