Warframe is adding a nice open world to the game. I've played the game a good bit and it's massively better than it was a few years ago. This might raise the bar even higher for D2 expectations for some players. I know a sizeable portion of the Destiny player base played Warframe and enjoyed it.
EDIT: I never said Destiny killer. I believe games tend to kill themselves. Ironic eh?
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"you see that mountain, that's actual playable space" Dig at destiny?