Dear owner of Harry Otter, if you are on mobile you can request him! How to request a tame: You know where you put clothes on? Tap on the button that says how many tames you have, scroll until you find his name, tap his name and tap request. He will be with you soon.
They can carry multiple artifacts, even on official, and provide hypothermic insulation against the cold. Literally a must have for running artifacts if you plan to spam run boss fights for element. 10/10 would smash again.