Years after the Heart of the World melted, there were no longer multiple adventurer's guilds, but one single worldwide adventuring union.
It was more of a crafter's guild, as anyone would tell you. For the dungeon core Leander had control over all the other cores, and did not let them rampage. Therefore, the need for adventurers was gone.
But they did not just let that stop them from joining the Adventuring Union. For, it was the surest way to riches there was.
Do you want to learn Alchemy? Why, sign in with the Adventuring Union, and you will gain access to as many Blue Bells as you wish! Perhaps you were into smiting? Well, the Adventuring Union owned the biggest titanium deposit, which was directly under the former Heart of the World.
Do you perhaps want to live forever? Well, that could be done, too. For guild master, Leander was not stingy with giving the SSS ranked adventurers' dungeon cores for them to bound with.