Mobile player, I was doing dodo hunt (kill 250 dodos. Not as easy as it sounds) with my Griffin and my otter, and my otter FELL OFF MY SHOULDER and landed in water full of mega. Then I start getting messages, "your Harry otter (otter lvl 57) killed a megalodon (lvl 30)" I got at least 5 of these. Go OTTERS!
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.