But Dread Lords in GC2 can't channel magic. How do you explain that?
It's magic. I don't have to explain it. This excerpts might do it, however:
"According to Drengin scientists, Death furnaces work by harvesting what the Drengin call the Aul. They claim the concept was originally from the Precursors (most likely the faction of Precursors called Dread Lords) who believed that Aul (what humans might call a ?soul?) can be harvested and turned into a form of powerful energy.||According to legend, the Precursors had immense amounts of this type of energy which, for lack of a better term, is called 'dark energy'. This energy was native to their existence and is the basis of their power."
"The Altarian race is the only race that has dark energy part of their inherent nature. While some races, such as the Drath have some concept of it, only the Altarians are innately...magical (as some humans might describe it).||This extra form of energy is not well understood but enough is now known to enable us to begin to systematically train our soldiers in its use. As a result, our soldiering ability is substantially greater."