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I have almost 100 hours in this game and I still have no idea if the horns can be used to scare off mantas or not. I thought at first they attracted them, but I've seen people say that it works. I know they dislike sound, hence why they attack engines, so I could see it going both ways.

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over 7 years ago - /u/Fureniku - Direct link

To my knowledge this is just an old wives tale and horns don't scare them away. As you said if anything, it should attract them - but honestly from what I've seen they just ignore the horns entirely.