Vulpes

Vulpes is a union that we actually have quite little data on.

Vulpes is the union responsible for.. balance, apparently. Yes, all we've gathered was... them enforcing one of Gideon's Rules.

...Usually a Union does two things, though. We do experiments to discover scientific laws, and use them to invent technology. Unicornus discovers new worlds, and investigates those worlds for secrets. Ursus leads over the town.. But also does espionage. Anguis spreads Lux.. but also serves as a mediator at times.

We find it quite unlikely that this was Vulpes' sole purpose by Gideon. Yet Vulpes doesn't seem to plan on telling us anytime soon what their other role is... That is, if they have one.