The skill of turning steedgrass into rideable mounts.
The basic mount for each of the races has the same HP and stamina. The more advanced mounts have higher HP pools or stamina.
To craft a basic racial mount, you will need one steedgrass in your inventory.
A Bluetail Runner has less HP and more stamina then a basic racial mount, and requires 2 steedgrass and 20 leather to be able to craft.
A Battlehorn is larger and has the most HP of rideable mounts. It requires 2 steedgrass, 10 iron ingots, and 3 leather to be able to craft.
A list of the mounts currently available in the game can be found here.