The Conversion Bureau: Transhumanism Worldbuilding · 11:06am May 16th, 2019
In the Transhumanism verse, the idea of a Transhuman potion had started when a man had taken an Earth Pony potion in 2012, which, instead of turning him into a pony, had a completely different effect:
He remained as a human being, but was now resistant to magic, thus becoming the first Transhuman: a Terran.
This caused the number of volunteers to the Bureaus to skyrocket, with many hoping that they too would become a Terran.