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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I read tge description on the embalming coil or orb cant remwber which one. But it spe ifically says they are used to upgrade weapon recieved from eris. So obvioisly murmur and Im thinking HOTP as well. Maybe there are other weapon she gives you too as your get a higher rank from her.