Palladein
"The short answer is that sorcery makes your eyes glow. Or, if you're using sky-metal to perform sorcery, the sky-metal glows." Eina explained.
[hr]
Vala
"Primarily, to show you how Vala can protect itself. This is possibly the largest concentration of sorcerers in the world, and they are more than enough to keep the city safe." Maribeth replied. "But also so you would believe me when I say I'd do pretty much anything that makes my military stronger and keeps my country's citizens safe, and that that means you can try anything you deem necessary to protect the empire, even magic."