Answer: Eternity
Once the fanfare dies down and the Holy Council of the Gods comes to order, Thor and the others discuss the possibility of stealing his Thunderbolt and using it to rush the Shadow Realm. Their talking from the bleachers doesn't go unnoticed, however, and soon Thor is called to speak onstage before the Mighty Zeus. He speaks about the God Butcher and his conquest to kill the gods of the universe, but Zeus is unbothered-- he killed some lesser gods, after all. Zeus attempts to send him back to his seat, but Thor's defiance gets him chained to the stage and revealed. Zeus reiterates that Asgardian problems aren't the problems of the other gods; Thor asserts that Zeus is just afraid. That's what gets him talking.
Zeus assures Thor, quietly, that he's not necessarily afraid, but he knows of the power of the Necrosword and does not wish to put himself or the other gods into a place of vulnerability. Besides this, they are safe in Omnipotence City. Thor asks if he can use Thunderbolt to stop Gorr, but Zeus refuses to help with this as well.
Instead, Zeus tells the council room that the God Butcher can never reach Eternity. Valkyrie explains the meaning of this to Jane, suggesting that Eternity is a powerful being who will grant the desire of the first person who reaches it. Gorr doesn't know the location of the Altar of Eternity, but the Gods do. And that's why Thor and the others can no longer leave, else they'll reveal the secret and put them all at risk. Valkyrie puts her plan into action at this go-ahead, and the foursome make moves to fight their way out.
Thor and the others commence battle with Zeus' guards before Zeus fires his Thunderbolt directly through Korg, disintegrating him into pieces. Zeus threatens that Thor will be next, but when he tosses his weapon at the Asgardian, Thor grabs it instead, tossing it back and through the Leader of the Gods. Thor is able to locate Korg's still-living face and pull him from the rubble. As Valkyrie ties him to the back of her head, he whistles for the screaming goats, calling them and their boat into the Council chamber. Valkyrie grabs Thunderbolt before they depart Omnipotence City.