Amberser was busy with his own affairs when the God of Alchemy summoned him to attend the All Nations Conference. He explicitly refused.
"The conference hosted by the Lord of the Dawn is, on the surface, about Laine apologizing and making reparations, but in reality it's about giving the Lord of the Dawn some face. What's there to talk about? It's just about seeing what benefits the Lord of the Dawn will offer."
Amberser disliked such boring games of cake-cutting, especially when the knife was held by a Deity.
Moreover, his relationship with the Lord of the Dawn was currently stable; there was no need to create discord over the minor benefits of the Mortal Realm.
"This is Flint's suggestion. It's rare that he's figured it out."