[THE GOLDEN CRUCIBLE]

A cult of rogue Fae who seek to dominate the planet by force rather than peacefully assimilating with its existing denizens.
Quickly grew more powerful and dangerous than ever expected to.

Seem to operate focused on "purity", crusading dominion over others, power, control, enlightenment and favor from some unknown higher power;
See themselves as divine instruments for change and dominion over the world.

Developed destructive biotech/bioweapons in the form of created viruses and disease as well as deeply saturating their society with manipulative propoganda
in order to achieve and insure absolute control and dependance, inability to desert -
if they made sure their members were sick in ways only they could "help" them, they could never leave them.