The Aegios Peninsula is a province of Imperion on the empire's southeastern coast, covering the northern reach of the peninsula; the province of Solena holds its southern tip. It is a land of high mountains and deep valleys, known for its stonework, its trade, and the old ruins scattered through its hills. Prosperous on the surface, it keeps its secrets: buried places that draw treasure-hunters and scholars up into the highlands.

Aegios is defined by Vulcanus Ridge, a spine of snow-capped and volcanic peaks that drops into fertile valleys below. The Crimson Gulf lies along its western shore and open sea to the east, while Solena borders it to the south. Its settlements run from the military seat of Valora to the port of Caldorus, the scholarly city of Montavor, and the dwarven stronghold of Montis Ferrata, with smaller villages between.

Aegios blends human and dwarven ways. Humans honor the gods of the Radiant Assembly alongside the dwarven pantheon and prize learning and the arts, with Montavor as their seat of scholarship, while the dwarves of Montis Ferrata are master smiths and engineers. The province lives on trade, mining, farming, and craft: Caldorus moves goods by sea, the mountain towns work ore and metal, and the valleys below Vulcanus Ridge bring in rich harvests. Magic is respected but kept under careful regulation, and both peoples are drawn to the region's ruins, treated as relics of lost ages.

Aegios is not one state but many. Each city rules itself, Valora under a ruling Archon, Caldorus under a Senate of merchants and nobles, Montavor under an elected Archon and a council of scholars, Montis Ferrata under a dwarven Thane, and Hartham under a Warden of the Order of the Iron Flame. When a matter touches the whole province, their representatives meet as the Council of Aegios.