Polities of the Long Night

[whulorigan]

As I recall that's from the T4 book Anomalies which was not exactly well-received, and took an even looser approach to canon than T4 did in general.

I was remembering it from the intro text to each TL Section in Emperor's Arsenal, for the most part.

As for fusion+, it allows smaller powerplants, and that's about it, so it allows fusion powered grav tanks and space fighters.

Yes, but that is a huge improvement because of fuel energy density and endurance issues over fuel cells, batteries and other compact power sources.