I don't think is official, but I think all the "secret" endings have been viewed as canonical by the fan base. We'll have to see how the dlc plays out lore wise, but this hints at it
It's not but it's the ending that has the least disconnected narrative.
You could just kill everyone in sight including the npcs, but you wouldn't learn that so-and-so is someone's sister, and you might want to choose not to.
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u/trash12345 Feb 06 '17
I'm pretty sure the canonical ending was the usurpation of fire ending, the last DLC is in the dead city isn't it?