There were three main reasons why a chief shaman was made to give up her throne before she reached the end of her lifetime.
The theological reason was that as one got older, they got weaker and weaker until they were no longer the best vessel for the divine spirit.
The political reason was so that one person did not hold onto power for too long.
While the societal reason was to avoid a successor war if the chief shaman suddenly died without nominating her champion.
That last reason however was a bit weak because it was not like chief shamans were immune to diseases or injuries.
Many many had died prematurely to various illnesses and even assassinations without leaving a clear successor behind.
When that happened, it predictively led to various strife and internal chaos.
But overall, history provided unequivocal evidence that the practice of removing chief shamans by their sixty-th birthday had brought great stability to the Helvati.