Ok, to save everyone concerns over the talisments, they are minor enchantments. Protection From Evil, to be precise. You really don't need them and the only reason that I mentioned them at all is because someone cast detect magic and one of the yeti were within range.<br/><br/>If you decide to fight them, the odds are roughly even with a very slight advantage for the yeti due to numbers. It wouldn't be a total party kill, but someone is probably not going to feel very good at the end. If the party insist on going further, they will not be stopped, only warned again that proceeding further puts their lives and souls in danger. The communication barrier won't allow a more detailed explaination, but the current scene has given you the information that it was designed to. Someone went to a lot of trouble to create a large and intricate illusion to fool someone, at least for a while.