While looking through the achievement list specified in the collector guide, I found [quote]dragon slayer[/quote] described as [quote]kill a champion of the dark[/quote]
[spoiler]honestly I'm more worried about complete a raid on hard [/spoiler]
Edit: I thought the one in the trailer could've been background creatures like titanfall, which had giant elephant worm things
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Or maybe that achievement means kill the finally boss in Vault of Glass because it is the very last boss of the game and the hardest. So wouldn't it make the last boss the champion of the dark? Just and opinion tell me what you think!