Vorago's new drops include: Abyssal Bludgeon, Vanguard, Malevolent, Twisted-Bow, Gilded, and Blazing Flamberge. He is located in the free-for-all white portal.
Boss pets are a very rare drop. There is a 1/1000 probability of obtaining one. Thus making them the rarest drops in-game. If it is not obtained by the 1000th kill, it will automatically be given to the player. Boss pets are available for every major boss in-game.