How much lore or taming would you have to have just to ride one? I had someone ask me and I have no clue.
I don't know the exact number but I'd recommend having it GM . At the minimum skill level the creature will often disobey a given command resulting in you having to say the command more often than just once at a time. Now if you just want taming for the sole propose of riding a certain mob that's another story.(sorry idk the exact number)
I don't see the point in just being able to ride it, inst the point of the Nightmare to use it, and if its just for show... i guess the toons template will be empty anyway. remember, everyone and their mum has a tamer on UO:R