Ganja

"Wazukyan to Ganja members"

- This place, more valuable than gold could ever be...is our home.

Ganja was a suicide corps of outcasts that travelled by ship; their primary goal was to reach the Abyss and discover the Golden City.
 * anime_debut = Season 2 Episode 1

On their voyage to the Abyss, every ship except for the main one was lost in a storm.

The survivors of this ship delved deep into the Abyss, eventually reaching the 6th layer, which they referred to as "The Golden City".

Upon discovering that they could not return to the surface intact after reaching the 6th layer, they set up a permanent camp and later founded the village of Ilblu, to "Become the first citizens of the Golden City".

Trivia

 * Ganja came to be called that name because of the ship they use.