The Doyen are a race of beings in the Trinity Universe that exist only as energy and are masters of psionic manipulation.
Warning! Spoilers Below!
The Doyen were the race who gifted the eight original Proxies with their psionic abilities as well as their respective Prometheus Chambers, due to concerns of humanity evolving into Aberrants. Aberrants channel quantum energies, which are naturally disruptive to the psi plasma which the Doyen are composed of. Being a naturally cruel and cowardly species, they wish to remove all quantum powers or even species with the potential for quantum powers from the galaxy, as shown by the destruction of Bullseye and its natives. To that end, they have quietly kept the Qin on a subtle leash, provoking the stagnation of their society.
There are two "factions" within the Doyen race: the first believes that humanity should be wiped out in self-defense, while the second believes that humanity can be used as a weapon against itself, and later as a tool against other potential quantum species, similar to the Qin. It was the second faction which appeared to the Proxies and helped them become the first psions.