Best Province targeting ritual?

[Norfleet]

Generally, attempting to specifically kill population is a counterproductive exercise in the long run: It's hard to even tell what the population of the province *IS*, unless you have dominion there, and unless you are losing, that province will shortly be yours anyway, so you're just killing your own population: As such, Black Death can be considered to be the tool of either the dead, or the desperate: At the point it's available by in the game, any opponent that is sizeable enough to make you that desperate will not be greatly harmed by it unless you cast it an unreasonable number of times on a large number of provinces....but if you're losing, where are you getting that many death gems to waste just trying to kill population? If you're Ermor, on the other hand, it's certainly more attractive, but you also have so many other uses for death gems than frivolous killing of random population.