At the end of the new exotic quest for 'dead man's tale' the dead guardian is suspended and has parasitic tenticales coming out of him, which is supposedly caused by the darkness.
There's already been mention of future dark subclasses and one of which is corruption - and all that jazz coming out of our dead friend fits that bill.
Massive reach of a theory, I'm quite aware; BUT if not, you read it here first.
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Wouldn’t be surprised if it was a teaser. I hope the new Darkness powers are called Attrition. Stasis holds things in place and Attrition breaks things down. But that’s just my two cents.