Ersetu

What it is: The name of the planet — a world shaped from the bound corpse of the Seventh Primordial Dragon, its veins forming the Dungeon and its heart pumping raw mana into the depths.

Ersetu is the world. Every continent, every ocean, every tunnel of the Dungeon exists on or within it.

Creation Myth

According to Ikosian mythology, the gods created the world from the remains of the Seventh Primordial Dragon. Unlike the first six dragons who were slain outright, the seventh was captured and bound — its body reshaped into the planet and its mind scattered into fragments.

The Heart of the World

The Dungeon tunnels are believed to be the veins of the bound World Dragon, converging at the planet's core. There, the still-beating Heart of the World radiates the chaotic vitality that creates ambient mana and births the increasingly alien monsters that inhabit the depths. Modern scholars dispute whether tunnels can physically reach the molten core — but they cannot explain what else maintains the Dungeon's impossible structure.

Geography

The planet consists of five major continents:

#	Continent	Description
1	Altazia	Modern heartland. Campaign setting.
2	Miasina	Ancestral heartland. Divided into Xlotic (desert north) and Koth (jungle south).
3	Blantyrre	Wild frontier. Home to non-human civilizations and Shifters.
4	Hsan	Isolated dynasty. Single massive state (the Grand Dynasty).
5	Oreina	Ice plains. Uninhabited, unexplored.