http://images3.wikia.nocookie.net/__cb20130329155312/destinypedia/images/7/73/Races.png
For those who did not notice, there are 5 enemy races, in the yellow box you can see the onyx pyramid ships. I believe too the reason we have not been shown this enemy yet, is because the enemies in the yellow box are the ones that wiped us out, the one that the white sphere (Traveler) protected us from.
English
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The Glimmer are slender men. :(
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Now that you say that, they do seem to look that way X3