The Hierarchy

They appeared in the Buffyverse crossover with Fallen Angel (IDW comic) to make Illyria kill Liandra and restore her primordial form.

According to the they are Wolfram and Hart´s first clients.

Canon Status:
As they appeard in a crossover and are part of an independent universe their canonicity is unknown, but presumed to be non canon characters.

Appearences:
 * Fallen Angel: Reborn # 1