Tameables found at the area surrounding the Slasher Of Veils. (So were the Hell Hounds but idk what they have normally to know if they were anything special - & couldn't be bothered to find out.) They need subduing before Taming, though theres no indication when that happens, I Tamed it redlined with about 30 hp left. They lose their poison immunity when Tamed. Also lose (as far as I can tell) their ability to breath + poison while mounted but they can still breath + poison while attacking. They can't be armoured. Notice, they have no prefered food, this probably means you need to take part in the event, pushing one side back completely to get the Blackrock Stew, which is difficult to get, and if you need two of them (one before and one after a week) it could take a lot of effort. Edit: Forgot to mention, they take 3 follower slots.