Green a self named demon, a lvl 340 Frenzy King that came in Ravenhall from the initial portal that Adam Strand opened.
It should be noted that he is the only demon seen with skill at summoning.
While in Ravenhall he subdued and ordered around a bunch of Mind Weaver but was in part defeated by the Shadow's Hand when they retook the city.
He fought Ilea one-on-one at that time, overpowering her because of their level difference and fled the city.
Around a year later, the Shadow's Hand received a request from Riverwatch concerning demons sightings around Stormreach, after some investigations from Ilea she found that it was orchestrated by the self titled King Green.
With the help of the Lady of Benevolence (level 283 Spirit of Blood) and Collin Rey the last member of the Sanctuary Healing Order who provided a diversion for Ilea killed him after a little brawl.