Althing

"Thor, you've returned!" "And with the power of Scabrite. Where's Mangog?" "Odin stands against it in the Althing."

- Loki and Thor

The Althing is an arena in Asgard.

History
After defeating Surtur and gaining Scabrite, Thor returned to Asgard, which was under attack from both the Frost Giants and the Fire Demons. Loki informed him that Odin was standing against Mangog in the Althing, but advises Thor to aid Heimdall and Sif in retaking Bifrost Bridge. Odin has stated that Mangog could be defeated until the forces that fed it hatred were destroyed.

With Asgard's enemies defeated, Thor made for the Althing to confront Mangog. Since Loki had advised him to do that which unleashed the creature, Thor brought him to help him defeat it. They found the weakened Odin barely holding his own against it. He urged them to finish the abomination that they have unleashed. Weakened without the hatred of Asgard's enemies fueling it, Mangog was vulnerable to the power of Scabrite and was destroyed once and for all.