The Base of Yggdrasil

Mephistopolis, Yggdrasil Interior

Carved into the deep trunk of Yggdrasil, a subterranean necropolis that was the first city to 'take root' upon Yggdrasil's corpse. The city is named after a rather unknown character from Galiavan history, an Alchemist named Mephisto who was a mortal and enemy of the Demon King Faust. Faust, upon establishing the empty and vast 'Realm' created by the Yggdrasil Rift as his safe haven for the Demonkin under his protection. For Mephisto, he found himself digging into the trunk of the great elvish tree, the only location in the realm he was protected fully by Faust's influence and great demonic power. Over time, the alchemist began building a grand fortress and underground city, soon populated by 'wayward souls' and living beings alike... It is unknown what happened to Mephisto, nor why the city was eventually abandoned and near forgotten by those who live in the utopia above... but as Alchemist's say- 'As Above, So Below'...