One day, as I traveled the plains of Hyrule at night, I saw a blue light emanating from Satori Mountain. Curious, I climbed up and was met with a stunning sight. A herd of Blupees surrounded a shallow pond, and standing regally in the center of the pond was a blue horse-like creature with four eyes and golden wreaths for antlers. I took a picture and the Sheikah Slate informed me that this creature was called the Lord of the Mountain.
It looked vaguely horse-like, so I snuck up behind it to see if I could mount it. Surprisingly, I could, and it immediately tried to buck me off. Luckily I had a bunch of stamina replenishing food, so I was eventually able to tame it like I would any other horse. After a brief amount of testing, I realized that this "horse" not only had a full 5 stamina, but also seemed to have higher base move speed than any other horse I'd found thus far. It was clearly an exceptional speciman, and I was ecstatic at my discovery.
My good fortune did not last, however. Eventually, in the morning, I noticed some other random curiosity and I dismounted temporarily to check it out. A few seconds after I got off, the Lord of the Mountain bounded quickly away and disappeared in a puff of blue smoke.
I've checked the mysterious pond again and the mystical blue horse creature does respawn there every now and then. My question is, is it possible to keep him as a permanent mount? If so, how? Can I board it in a stable?