Because of the lack of proper karma some souls turn into evil spirits after death &such invisible spirits will cause many sufferings to living souls. By chanting manthra’s , installing such negative forces into metal or wooden or stone idols is done in aavaahana. The person who is doing it & for those whom it is to be done should chant "Gayathri manthra" every day & should observe proper vruthams too.
Jishnu Vasudevan Namboothiri
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