Shinryu will give us Legendary Kamuy. The unlock for this one is super simple as well you have to talk to the Minstrel in Kugane.

Video guide start at 1:45 to about 7 - not the best but its the only one I had that I found for mount farming that had sound
https://www.youtube.com/watch?v=s784j9cWi8s
MTQcapture version if you perfer
https://www.youtube.com/watch?v=Pnqopy0Q4dI

Click image for larger version

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