Thor, Loki and the Odinforce travel to Surtur's realm where Thor makes a deal, Surtur fixes Mjolnir and in return Thor cuts him and his army a path to central Asgard where they will find a final battle.
As the Asgardians battle Surtur's forces Beta Ray Bill finds himself removed from the battle by Thor who tells him to return to Earth as a hero so that people will remember asgard through him and sends him home.
Thor then ressurects Fenris so he may devour the moon and ragnarok can finally come to fruition.
Thor then proceeds to shatter the fabric of Ragnarok thus forever ending the Cycle.
Those Who Sit Above In Shadow try to make him stand down and thor refuses, he destroys the fabric which means there is no rebirth and the Asgardians are truly dead, he then surrenders to death and allows himself and Loki to join their kind.