"The evil god of Arda, Melkor, had an evil - helper-god, a smaller god, Arda has lots of those, called Sauron." He can do accompanying osanwë visuals. "And he came to this world, and he wanted to do a terrible evil ritual that would hurt lots of people, to bring back the original evil god. But he disguised from everyone that this was his goal! And he claimed he just thought that the worlds should not mix, that Quendi should be Quendi and humans should be humans and they should live separately how the gods intended. And he had Vkandis's sympathies, in this, because the meeting of the worlds had made the future very noisy and confusing, and the gods are afraid when the world is noisy and confusing.
So he allied with Vkandis, and tried to kill the Quendi and kill the King of Valdemar and kill the Hero of Many Names, who had helped Vanyel win the war in Arda, and tried even to kill the Queen of Karse, who was loyal to Vkandis and wiser than he was, and saw that this alliance would serve him terribly. But Vkandis, half-blind from all the strange changes in the world, saw only that he would oppose her in this, and so he tried to have her killed.
And they attacked Haven, and since Vanyel was not in Haven their attack was mostly a success, and Vkandis thought that the disruptions to the world would be over, and Sauron thought that soon he would succeed in his evil plan to raise his master from the dead. And in Arda, even King Treven and Queen Jisa of Valdemar and Herald-Mage Vanyel despaired, because so much had been lost in the attack on Haven, and because against Sauron and Vkandis together they feared they were helpless, and because the first victory over Melkor had cost them dearly and they could not see a path to defeat him again.
But Valdemar's own god was not dead, and was waiting patiently for the path to victory to open. And at last he found it. The Hero of Many Names had died in the attack on Haven, but the Hero of Many Names knows a way to cheat death, and he returned to life again in Velvar. And in him, Valdemar's god saw two opportunities. Firstly, he is proof that death can be cheated, that the dead can be returned to us, forgetful and altered but mostly whole. And secondly, long before any of these things happened, he had foreseen that it might be necessary to go to war with Vkandis, to go to war with all of the gods allied, even - and he had devised a plan to do it.
His plan was very terrible and dangerous, and so he had discarded it when Arda was discovered, hoping to achieve his aims through peace instead of war. But the plan had not been forgotten. And when the Hero of Many Names made his way from Velvar back to his home, when he made contact with Vanyel in Arda, when he learned how desperate Valdemar's situation was, he realized that it would be necessary after all.
His plan was to make a new god. The gods of Velgarth find it difficult to talk with us, and we find it difficult to talk with them. But he had designed a way to make a god who understood us, and could speak to us, and would listen to us. The people of Arda volunteered to help him do it. King Treven, too, said that the people of Valdemar would help, if they were asked. And while they worked on their god, Sauron prepared to summon his.
And on one evil day, Sauron struck. He destroyed cities for blood-magic, hoping to use them to have the power he needed to bring back Melkor. Everyone was desperately afraid, because they were not ready yet to build their own god. But the good gods of Velgarth joined to help them do it. Valdemar's own god gave them time outside of time, to make sure that everything would go as planned. The gods united to steal from Sauron the blood-power he would have used to summon Melkor, and use it instead to create our own god. And the Quendi god of death came to the gods of Velgarth and offered to teach them how to return the dead to life, as is done in Arda. And the peoples of Arda and Velgarth agreed to help build the god, even if it meant their own deaths, knowing that afterwards they would be restored to life in a world freed of evil gods forever. Then the new god and Sauron fought, with Herald-Mage Vanyel and the Hero of Many Names helping the new god, and the battle was long and very terrible but the forces of good were triumphant, and King Treven and Herald-Mage Vanyel returned to Valdemar to rebuild."