Question about the 'Necromancy' skill and 'Necro Call'

[Jamers]

I get hundreds of Inquisitors through the Reserve skill (which I believe requires one point in Diplomacy. What Reserve does is this: if you look at you army on the Hero screen, there are two small boxes off to the right. Those can't be used until you get the Reserve skill, at which time you can place an UNLIMITED number of one unit (two if you put two points in Reserve). I was hesitant about it too at first, wondering if I wanted to waste runes on Diplomacy, but I find Reserve to be absolutely invaluable.

This way I can buy up x number of Priests where x is the number of Inquisitors my leadership can sustain, upgrade them to Inquisitors, stash them in reserve. Repeat.