The city in the sky

This was a lineart I did for Inktober2019, the theme was built, so I did a play on words to create this fantasy world, the story behind it is unclear to me, but creating this I came up with the idea of these two voyager brothers, one youngest who's an archer, and the eldest whos a mage, they finally reached their first destination, a floating city high up in the desert sky...what business do they have up there, and what is their next stop??