A Steed of Rock

First enchanted by a dwarven wizard, a follower of the Wanderer, the stone of the horse is a potent rock that can create a statue of a horse and animate it so that it can be ridden as a steed. The method for making of such a wondrous object has been lost to time, but a few such antiquities remain in collections around the lands.

Just a little note inquiring about the mechanics of the stone...
Is it acting like the regular horse once you have it activated? How do you "unsummon" it?

It "unsummons" itself when you sleep.

Ok thanks for the answer...
I will also summit a post for the bugs...not sure if i am the only one...but sometimes when i summon it..the horse is "invisible"..and when i mount it i get the image of a female hafling instead of the horse.. i got to take a print screen otherwise no one will believe me...