Weapon Ascension Material.
A nightingale holding a burning wick in its beak is the insignia of the Lightkeepers.
It is said that in the past, the nightingale insignia belonged to a renowned noble house in the northern kingdom. In the shadow untouched by light, a boy, later known throughout the land as the legendary thief, carved his first raven insignia with his best friend in imitatation of the nightingale insignia.
But that was many years ago. Nowadays, the raven insignia could be seen anywhere, but the nightingale that the raven once looked up to still dwells on the tower, singingly lamenting the winter city to the light.