"I haven't been out there long. I appeared a little over a day ago near a spindly metal tower on a ridge. It was abandoned, just some unfamiliar machines left, and a note I couldn't read.
"I originally followed your light because I wanted to know where I was. Judging by what I've heard about the weather, I think it would be best for both of us if I joined your city. I can normally survive out in the wilderness, but I do need to eat as much as any other human and am not confident in long-term hunting if the weather stays like this.
"As for what I bring - I have six hours of shapeshifting magic every seven days. It keeps the same mass and the same atoms, but can re-arrange them - graphite to diamond but not lead to gold. This magic can be put into charge-stones to be used by others for healing, but anything more complicated takes a lot of practice. Since there is time pressure, the most maximally efficient thing is probably to have me create organs which can generate useful chemicals - vaccines, antibiotics, silk, anything else that can be grown from a living thing - that can then be harvested repeatedly. That will let about 3 hours of magic create a constant supply of a medicine for years rather than needing to heal infected wounds manually each time. I was in the process of learning how to create seperate functioning systems so they could be taken out and survive seperated from me, like a houseplant on a windowsill, but the extra life support for the organs would take more magic and matter to create.
"I'm also trained in mundane medicine, though I expect I'll need to check with your doctors before they determine I'm up to the local standards.
"Uh, and possibly remove this fur or mess with the edges so it looks more like a coat."