First of all you need a deathknight to get this ghoul, its a talent point and it is called "Master of ghouls"
i hate to wait for it to get 100 % hp and u waist so much bandage from it (and time).
The only thing u need to do to get it to 100%hp is to mount up and down!
tada it has full hp again. im using this all the time and it is really good!
Well this is my third post(A) hope you like it and hope its not a repost!