Padmasambhava mantra

AH KA SA MA RA TSA SHA TA RA SA MA RA YA PHAT

it is used as a basis to build the infamous seven line prayer to guru Padmasambhava of the tibetan buddhist trads
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one time guru Padmasambhava a.k.a guru rinpoche needed to take on many mages in tibet who challenged him
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and a lion faced dakini / deva appeared and gave him a box
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the box contained the 14 syllables
when the mages challenged him, he spoke the 14 syllables and vajras fell and rain on the mages defeating them