The Blackthorns were not the wealthiest in the world solely because they had successfully monopolized the forging of weapons, equipment, and accessories from resources harvested from dungeons; they had also established their own guild. A guild that housed the most talented espers in the world, with three of the top five.
The five most powerful espers in the world, referred to as 'World Ranks', were named as such because if even a single one of them decided to wage war on the world without the others interfering, they would most certainly not be able to be stopped.
Such a conclusion was reached by how each of them once soloed S rank dungeons in record time. Not leaving a single monster alive after their encounter.
