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Companion riding a mount I don't own
I have the total of 3 mounts on my PC version. A brown horse, a durzog and the bear from doing the Orsinium quests.
Sharp as Night has been trotting around behind me on a mount I don't recognize. A white horse, with a grey mane with what looks like confetti coming from the middle of it.
It most certainly isn't in my mounts. I do have mounts set to randomized so I guess it's drawing from an invisible pool.