Ingoswitu was born to the prestigious Aequiala family, known for their prowess and valour in battle, as warriors and as mages, and for rumours that a distant ancestor was an angel. Ingoswitu's birth confirmed the latter, as it was clear that he had divine blood in him, however distant. He was brought up kindly and fairly, and taught the basics of combat, as any scion of Aequiala would be.
One day, when he was 15, while exploring the area underneath the city he became lost, and his attempts to find his way back only led him deeper, until he found an underground cavern far below the city, where he found an aboleth. What happened between him and the aboleth he does not remember, but he fled some unknown time later, forever changed.
On the surface, he found he had no desire to return to his family, and wandered into the shadier parts of the city, where he was found by a cultist of Mordiggian. Sensing something in him, she recruited him into her cult.
He integrated well into his new family and within a handful of decades became a high priest, but he was still not satisfied by his insight into his god. He began spending time poring over obscure texts and trying to fit into his mind knowledge far vaster than it could hold, while fearing that even a lifetime's work could go by without even the most meagre understanding of his god's true nature.
His fears were right, in a way. He worked for two centuries, but eventually, merging pieces of information together in a way that didn't quite seem to fit, he had an indescribable revelation, so powerful that it warped his mind to emulate the ghoulish god that he worshipped.
Despite having finally begun his centuries-long goal, he felt a strange desire to leave and gather power of his own - a desire that he would later understand as stemming from his newfound understanding of his god. Almost on a whim, he took his few possessions and boarded a ship for the continent of Dusst.