What is the candle made of in shadowmancer?

In "Shadowmancer" by G.P. Taylor, the candle is made from the fat of the dead, specifically that of a murdered child. This macabre material is used to create a powerful and dark magic that plays a significant role in the story's themes of good versus evil. The candle symbolizes the corrupting influence of power and the lengths to which some will go to achieve their desires.