Spires have been solo'ed Confluxes have been solo'ed (PvT Nuclear, Warlock) Templar is -blam!-ing easy to solo, just keep auto cleansing over and over and damage him yourself, just make sure you aren't too slow or he engrages. This was easiest with infinite ammo year 1 black hammer You just need two players to join temporarily so the door at the end of Gorgons and at the entrance to the vault opens. Gatekeeper can't be solo'ed though so GG