Heart of the Black Dragon currently states in its tooltip that the active goes from an 8% damage increase at legendary, to a 6% damage increase at mythic (same as epic).
I'm on console - can't test if it's just a tooltip issue, or if mythic and epic-qualities provide the same buff.
This artifact sees regular use in group content/isn't dead. think it's worth bringing up and putting time into fixing.
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Edit: Ok, I just tested it on PC and its 10% for 10 seconds.