Timeline...
Day One -
THIEVES!The two groups take stock of the supplies they have. The main group is able to note that they have enough to get to the sanctuary, but no more than that, as they haven't been able to scavenge much from the area around them. However, unbeknownst to them, they're not the only people in the area. A group of scavengers has also come, and are eyeing the supplies the main group has as they are running dangerously low. The Scavenger group plots to sneak into the main group's camp to steal the supplies they have. It seems everything for the main group is going smoothly. However, when they go to check supplies, they find them missing! Cue a mad search to find the culprits and get their supplies back. The scavengers have hidden nearby, figuring that they might be able to find out where this group is headed since they seem to be mobile and trying to reach a destination. Observing the group, they are discovered and an argument breaks out over the stolen supplies. When it's revealed that the main group is heading to Haven, a truce is called since neither group can survive for much longer out in the open and it's agreed that they can probably get there better as a group rather than separately.
Day Two -
The Traveler ComethThe group heads out and are discovered by someone searching for the source of the magic in the world now. Intrigued, the group decides to let him come with them to the shelter, which seems to be a strong signature of the magic. When they reach it, it's discovered that there is a fragment of the asteroid that hit the planet at Haven for study. This fragment seems to be what the man needs, and an agreement is reached to give it to the man in exchange for helping to get them to Haven (perhaps a teleport spell was in use here?).
Day Three -
Crossover Bit -
Ahh, My Goddess!A thief has stolen an artefact from the Pirate queen in the Global Warming world. They have escaped into Haven through a portal, and Tiamat has decided to follow. There is a confrontation with the goddess, as the people are distrustful of someone just appearing out of nowhere, but when it is discovered she is trying to track down a thief, the group agrees to help. As they search, it is discovered the thief has gone out of the safety of Haven and into the freezing wastes outside. The group, better equipped to deal with the frigid temperatures, venture out to stop the thief, and are able to recover the stolen artefact. As a result, Tiamat presents a gift to the people of Haven that helps them to better weather the current climate (be it an object that provides warmth for the caves, a spell to possibly make the area around Haven able to provide for the community, or whatever). The group is then able to breathe easier, as they see the possibility of surviving what has happened to their world.