All you get are legendary gloves, NOT the precursor to necrochasm.
Just a PSA so you don't get your hopes up.
EDIT: The precursor to necrochasm is Husk of the Pit, it DOES NOT drop from the hard raid (hotp). HOTP is supposedly a quest reward and can be EVOLVED into necrochasm.
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Hey man, Ascendant Shards are Ascendant Shards. Plus, that last mission was [b]fun.[/b] Bungie: "So, we hear you liked The Sword of Crota mission..." In all seriousness, though, I wish I had known they were legendary gloves so I could've saved my marks, but it's whatever.