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In page Bantu religion:

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The living, through clairvoyants and seers, may address the dead in order to receive advice or ask for favours. If a spirit takes offence in something done by a living person, he may cause illness or misfortune to that person; in that case, a clairvoyant may help that person to amend his mistake and pacify the angry dead. Catastrophes, such as famine or war, may be the consequence of serious misbehavior of the whole community.[citation needed]