Tales and Chronicles
Jewel of the North, formerly know as vincegetorix
You know what, I think I was wrong as always: this cant be a Nentir Vale book, because we've just had the Wildemount book, which hits pretty much the same notes but the ''points of light'' (which is why, given the designer comment on CoS, I thought of NV. The land of Barovia and the dangers around are pretty much a point of light setting).
Changing my guess to:
Traveler's Guide: Grand Duchy of Karameikos!
Changing my guess to:
Traveler's Guide: Grand Duchy of Karameikos!