Having trekked for over two weeks through the hated snow (twice as long as Tetch first estimated it would take), and having seen their companions hacked down by hungry creatures or simply lost to the wilderness, Tetch and Cyrus finally reach their destination: a hole in the ground which is supposed to lead into the ruins of an ancient city, at least according to Tetch.
It is up to you how much you've revealed to Cyrus about the truth of your character, Nanshork. You know that a group from the Outsiders is supposed to meet you at the entrance to this ruins, and you're supposed to team up with them for some mission, but have not been filled in on details beyond that.
I'm going to say that Thorston was killed during your trek. You guys can have his gear, which basically consisted of a few flasks of acid, a Healing Belt, and a +1 warning shuriken (hung around his neck on a leather thong, gives +5 to Initiative, value 160 gp, has to be attuned to work), along with some mundane gear like rations, rope, etc.
Basically, if there are some mundane items (or magic items worth 150 gp or less) that you left out when originally making your character, you can say that you picked it up off Thorston or one of the creatures you guys fought (I'm going to say the other PCs' bodies were lost/eaten/etc, and you weren't able to loot their gear. Or some of them might not actually be dead, just separate from you guys, giving them the option of rejoining in the future, being NPCs, etc). You guys can also feel free to make up stories on the details of what happened to the other PCs and Thorston, if you want, in the IC thread.