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I'd think dragons leaving (Patriarch wasn't hiding) had more to do with humans turning on them than anything the Black Ring did

You think too much and miss the point - there is no facts we can rely on.
You can play with your imagination as much as you can.

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You mean like pretty much every other plotline of RPG games, fantasy books, many movies, etc, etc?

Ookay.
Dragon Age. To kill hordes of darkspawn we gather the army. The Army even.
And when I see an epic battle where not just one Warden, but tons of his allies fighting darkspawn - I f*cking believe in that epicness.
Not laughing.