Haven't really talked about either of these much, though the homunculi are more obvious. Greed is one. An artificial human, essentially. The bearded bastard - one the homunculi call 'Father' made them as his henchmen to infiltrate the military and start wars to put his plan into action. It's....a long story. Xerxes was around hundreds of years ago, between Amestris and the eastern country of Xing, in the desert. The king wanted to become immortal and back then Father took advantage of that to instruct them how to create the first Stones for himself and...and Hohenheim, my father. He then created the Homunculi through using those Stones somehow.

[Somehow. He's seen it once before. Father putting Greed's Stone to Ling. Being unable to shoot even then with his friend's life at risk. Ed swallows, a bit pale before continuing.]

But yeah, back home Kimblee was definitely working with them. Greed is the only one here though and he's kind of a different case that does his own thing. So I don't think we need to worry about that here. But Kimblee on his own is dangerous enough.