It gives you and "item", item has 1 hour CD then its removed. You can use it and mount one of the horsemans mounts ...
Yes there is a possibility that this can give you a hidden skin (just one of my theories)
Meanwhile found this guy :
http://eu.battle.net/wow/en/characte...D0%BA/advanced
he has a "Earned the feat of strength Hidden Potential. 22 hours ago"
Well atm not sure for which spec ... (yeah big chance for blood but ... there is still a hope)
Armory is "unfortunatelly" not showing the item ... only achievement ...
If there is anyone from the russian realms please try to ask him ... this information is critical!
In hope of finding something usefull I am searching the :
http://www.worldofwargraphs.com/pve-...rs/deathknight
Anyone can confirm if the artifact "skins" are visible on armory webpage??? (mine is somehow not updating ....) or only the basic skin is visible ... thx