Hi my information about the origin myths of the uthgardt detail that Uthar was a Ruathym thane who led a raid on Illusk. The angry Illuskans destroyed the ships of the raiders and forced them inland beliving the orcs and harshness of the land would end them. They not only survived but thrived as they amalgamted with nethrese exiles. Uthar becomes the ancestor spirit and conquers the beast lords This is covered in FR5 module
Id like to see some more detail on both the ancestor mounds and shamans in the sections on the tribes. Maybe cover the tribal ritual enemies?