v.137 - Unleashed Update Notes

You have to have the riding skill to use it, as well as his saddle.

I hunted his mount for what seemed like an eternity before he dropped it. 180 speed is kewl

I have been HobPQing a bit for them, and have around 200 Hob Marks on my Merc, but gave up when I read that the Hyena Mount can't be used without the taming mount skill. There's no mount quest from Kenta or anything. Hopefully later on, they can either enable the taming mount skill be obtainable by other classes, or make the Hyena Mount into a permanent mount coupon instead of just a taming mob. So yeah... I guess any other classes except explorers or so can't use it.