I soloed it as a lvl 51 Arcane Mage. It wasn't too difficult, but if you're a mage you really only need to remember to have Ice Armor on and not use any water-based spells as he is immune to them.
Also, you don't actually have to kill Aquementas in order to get the totem.
Also, you don't actually have to kill Aquementas in order to get the totem.