In The Sacred Stones, which empire launches the assault on Renais?

In The Sacred Stones, the Grado Empire launches the assault on Renais.

The game opens on Magvel, a continent divided among several nations connected to the Sacred Stones. Grado is the largest of the founding powers and had previously been Renais's ally. Its sudden invasion defeats Renais and separates the royal siblings Eirika and Ephraim, setting the main conflict in motion.

The assault is not simply a conventional territorial war. Grado's forces are pursuing the Sacred Stones, magical relics that help contain the Demon King's power. Prince Lyon and Emperor Vigarde become central to the empire's corruption, while Eirika and Ephraim seek help from Frelia, Jehanna, and Rausten. A common mix-up is confusing Grado with Bern, the aggressive kingdom from The Binding Blade, or Adrestia from Three Houses. Those nations belong to different Fire Emblem settings.