[Norfleet]

Arcane Nexus also harvests an unknown amount of gems as "ambient energy", and I have no idea how much this is. All I know is that I was getting reports saying the arcane nexus was absorbing anything from 500 to 700+ worth of gems per turn.

I have no idea who was spending all that. I can only assume that the mystery extras come from this "ambient energy" amount. Although one time I got an 1800 gem kickback when I threw up a max GoH. I'm pretty sure that had to be the largest gem expenditure I made, and that caused the absorption to go from a normal 500-odd to 1800 odd, and it never went back to 500, and stayed at around 700, for the rest of the game.

Perhaps "ambient magic energy" is a kickback on global enchantments in the world as well? I was ramming up maxed out 999 point enchants, so that could be it. Ramming up a 1K-gem GoH certainly seemed to increase the output by about 200 gems....