It called some enemies "minions of the darkness". This means "champions of the darkness" must be mini bosses i.e dragon slayer achievement. The dragon we saw was on Venus, also where the vault of glass is, and the first raid we get. Dragons confirmed!!!
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ya im starting to think that maybe the final raid boss would be the dragon in the vault of glass, pieces do sorta seem to fit, but who knows, we'll find out soon enough
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Minion and champion are two very different titles.