Lubo

Lubo is a city where a Civil War took place.

Overview
A civil war took place in this city and the mercenary group known as Stone Wall became famous for being the only group that was able to survive the entire civil war without a single casualty.

Dark Continent Expedition arc
Muherr mentions the Civil War that took place in Lubo city, when he divulges the backstory of Golem's mercenary group the Stone Wall to Ging.