from The Comprehensive List of Gods and Their Curses: the raven queen was trying to prevent a war between gods, the wizards disrupted her plan. The Raven queen turned them into raven like bird creatures that could only obtain lore or magical power from the ruins of fallen civilizations

Morti’s research in the library
book written by Alestrail Silverhand

The raven Queen is trapped by her fascination by the past, she sits in her fortress amidst all the memories of the world looking at the ones that please her most as though they were glittering jewels. Many great wizards have attempted to understand her motives, but like a raven she has always remained cryptic keeping her secrets just out of their reach

references to holy people, clans and cults devoted to her