Re: Yeti king can't be killed

Boss Hunt is a game mode which is intended to be complex and extremely difficult and not everyone is going to have the skills necessary to survive to the end. If you're new to the game you're definitely coming in on one of the more difficult Boss Hunts due to the freezing factor involved.

I've posted a full explanation here; http://answers.ea.com/t5/Guides-Strategy/The-Kings-Day-Out-A-Tutorial/td-p/5845217