[He doesn't think anyone could. It's an impossibly huge number.]

The Seventh Umbral Calamity happened but seven years ago, and the realm had scarce begun to rebuild. Outside of that, the Sixth Umbral Calamity happened some fifteen centuries ago.

I believe you are correct in assuming it creates more resources. Aether, to be specific. It's the basis of all matter, living or not. As reflections of the Source, the Shards are, well... there are people on the remaining Shards who are descended from the same Sundered soul as me.