"Which one? Oh, him. He be Pancratius. Yeah, he's a bit moody, but he's all right when you get to know him. Ya see, back in the day, and by that I mean his day, before you an' I were born, he was a big shot. The gods loved him, and one day, he asked for a gift that turned out to be a curse. Once he figured out the horrible side o' his gift, he sought out an oracle, to figure out how to get rid of it. Ol' Pancratius ne'er did tell me what the oracle said. The gift? Didn't I tell ye? No? It be immortality."
-Old Gerald, man in the pub.
Brief bio of a space intel officer
The BRS Gwynith is an air ship of the Byrlothian Resistance. She is sentient, needing no crew to fly or man her, though she generally has a crew aboard for doing repairs and to go where she cannot.
A plague has hit the local area.
In humans it affects only the most vulnerable, the children and the very old, and even than it's little more than a summer cold. 24 hours of sniffles and then it's gone, barely noticeable really.
To sheep however it is fatal and the whole economy of the area is in serious trouble. If this keeps up the area could well be facing famine.
Somebody (enter the PCs) must find the rare herbs needed to make a cure.