I don't think that you will do this quest at only lvl 16 warrior .. when you go warrior as a primary or even a secondary you often have a nucker or a bard with him...
and to go to jakreth ... if tou are not port there ... you have to through Mohrum and the fact is that you won't be able to do this at lvl 16 / 0/0 ......
okay so I will precise a little
Before going to jakreth and kill the mammoth try to be at least lvl 20/20 even more
I did it a level 20/20/20 and managed to chanlenge them really easily (as a revealer, necro adn warrior...°