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So...
The unknown man isn't just one. They're actually a group of people who oppose the shamans. Ruairi is counted as one of their ranks. Later Tarlach is found to be one of them. Their goal later on in episode 10 is to sacrifice Millia in order to bring Macha back, which they did, when Tarlach restored the Lia Fial from g3. Cessair is one of the more influential people of them. Another would be Quasar's Heart who is also a dual wielding girl. They each work together but have their own agendas. They oppose the shamans who wish to keep the dragons under control.