[Shadrach]

In my experience, mages won't cast reinvigoration unless they have fatigue. If you want to reinvigorate communion slaves with a master, the master will need to cast something to give himself fatigue before every cast of reinvigoration. In practice this means you can only script reinvigorate twice per master and have it work. In theory you could do it every round with one master wearing a flame helmet, but I've never tried that.

My testing also seems to show that communion masters won't use gems to raise their skill level for skills that are boosted by the communion. They can use the number of gems that you would expect, but for some reason they can't use any of them to boost their skill up another level.