The Lord of the Mountain
The Lord of the Mountain is a unique mountable creature that you can find at the top of Satori Mountain (south of Ridgeland Tower).
You will know if the rare creature is in the area if there is a large blue glow at the top of the mountain.
You can mount is through normal means, however, it may take time to soothe it as you need at least two full circles of stamina in order to subdue it.
The horse has maxed-out attributes, which makes it faster compared to any other creatures in the game. However, the creature cannot be registered at stables, but it can be registered in your compendium, so make sure that you take a picture of it before you let it free.