Welcome to the forum Baatar. I hope Alan's explanation has helped you in your further understanding of Balinese dress choices.
If you spend some time using the search function you will no doubt find numerous discussions on the supernatural nature of keris. It is an aspect which has always fascinated me as well, though it is one that is difficult to have any real and meaningful discussion about in the space of an open forum. Stories are rarely first hand and frankly impossible to verify. From my experience members tend to either disbelieve such lore and feel it distracts from the hardcore discussion of keris or they are true believers who don't find this public place a proper venue for such tales.
Still, i always like a good story and find nothing wrong with the telling so if you have some to share feel free to start a thread on the subject.