Of Kings and Dragons
Ancestor worship, as practised by the tribes of the Mwangi Expanse is something of a misnomer. The tribes revere their ancestors, but do not worship them, and there are no clerics who derive their divine powers from ancestors. Instead, the spirits of the ancestors are seen as helping to guide and defend the people, and might be asked to intercede with an actual deity on their behalf.
The Mwangi sometimes use carvings of trees as an aid in remembering their lineage.