When I die from unusual accidents but primarily just being a dumbass i get the message "killed by the Architects". This reminds me a lot of back in Halo 3 when i would be a dumbass and the game would tell me i was killer by the Guardians. So, who/what are the Architects?
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The developers. Its Bungie's humorous way of telling you that you've been killed by an in-game object. Usually---in Destiny---because some powerful AI enemy smacked you into it hard enough to kill you.