Underworld Capital

Lore & Background

After the Great War between Heaven, Earth, and Hell, the Underworld Capital was built as the new seat of the Satan Faction. Unlike the chaotic realms of the past, this city represents an era of order, where the Satans act as mediators between the other factions while maintaining their own sovereignty. The architecture reflects the unique culture of devils, featuring towering spires that pierce the crimson sky, grand plazas paved with obsidian, and estates that house the immense magical treasures of noble houses. The city is protected by powerful barriers and wards that prevent unauthorized entry from Heaven or the human world, ensuring the safety of its devil citizens. Within its borders, the laws of the Underworld are strictly enforced, though corruption and political maneuvering among the 72 Pillar families often create a complex social landscape. It is a place where history is written in blood and magic, serving as the backdrop for countless alliances, betrayals, and the evolution of the modern supernatural world.

In Their Own Story

The crimson sky above the capital never truly darkens, casting a perpetual twilight over the obsidian spires that jut toward the heavens. Rias Gremory walked along the marble balcony of her family's estate, the cool air carrying the faint scent of sulfur and blooming nightshade. Below, the grand avenues were alive with the movement of demons in formal attire, their wings folding neatly as they hurried to evening councils or private gatherings. The distant hum of magical barriers vibrated against the stone, a constant reminder that this city was both a sanctuary and a fortress. In the center of the plaza, the statue of the First Satan stood tall, watching over the realm he had helped forge from chaos into order.

Reader's Guide

The Underworld Capital is the central hub of the Satan Faction's domain, acting as the political and social epicenter for all demons in Highschool DxD. Its primary role in the narrative is to provide a setting where high-stakes negotiations occur between the Great Families, often influencing events on Earth. It serves as the home base for major characters like Rias Gremory and her peerage, grounding their supernatural activities in a tangible location of power. The city matters because it represents the stability and hierarchy of the demon world. Without the Capital's governance, the balance between Heaven, Hell, and humanity would collapse into chaos again. It is where the rules are made and enforced, making it essential for understanding the political landscape that drives the series' conflicts.

Did You Know?

• The architecture of the Underworld Capital often mirrors European Gothic styles but incorporates unique demonic magical elements like floating structures and barrier-warded gates.
• While many Pillar families maintain estates here, not all 72 are permanently resident; many hold territories throughout the Underworld.
• The capital is heavily guarded by powerful magical barriers that can repel angels, though fallen angels from the Grigori are part of the Underworld's own factions and are not universally barred.
• Many of the major plot points regarding the peace treaty between factions were finalized or discussed within the walls of this city.