It says "Deaths are not enough for master Rahool." Master Rahool is the Cryptarch guy that you give all the engrams to for armor. I guess there will be another expansion where you findout his intentions? If you disturb the remains this happens)
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There is a [url=https://www.youtube.com/watch?v=dQw4w9WgXcQ]Video[/url] that sheds some more light on the possibilities of what the OP is referring to.