Explain what role the egwuwu, the ancestral spirits of the clan, has in the public trials of the nine villages of the clan.

The egwuwu presides over the trials dressed in masks. They act as the judges and the juries for the cases brought before them. There is one egwuwu for each of the nine villages. The leader, Evil Forest, gives the verdict to the people who bring the case before them and pronounces the sentence to be carried out.