https://m.youtube.com/watch?v=79Y6Q47qjlw
... They're really impressive...
[spoiler]not included in the DLC[/spoiler]
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I don't know who has more time on their hands, the guy who did this, or the guy who found this. Maybe you could make an instrument out of one of your tentacles. Sure it might hurt to rip one off, but don't worry, it will grow back. Just make sure to cut the holes after you rip it off, no need to make it more painful than it actually is.