UNKNOWN
I'd say banishment was one of the worst but at least in some cases if a member, or perhaps if the person  killed was a member of the royal family, depending on the feelings of that particular chief, that person could be killed and how was he killed?  In certain places they would tie his legs, throw him into a river pool.  In other cases they will thrown him into a ravine, but the issue of burning of human beings as it happened in the 1990's was quite unique, we never had it before.