[Claudius]

First rule for that trial is to not overwrite your saves in the chamber. If you save I think the trial neverends. Edit: to clarify it only neverends if its saved in the 4th trial...you can save during 123

So after the 3rd trial with the walkways and the duel with the ancient save your game and DO NOT OVERWRITE IT

Now fight in the 4th trial. Kill every wave of enemy. Don't worry about the ancient mage. He's mega hard to kill and you don't need to plus he's worth less xp than the other ancients.

If you are standing on a teleporter you are preventing the final wave of guys from coming through that porter so stand aside (though its smart to limit the rate of enemies by standing on one at first)

Now everyone is dead (except maybe the mage?) eventually you can go over to the sides and the elevators come down. One elevator leads to one of the best bows in the game so get that first. The other televator leads up to the exit.