I know what it does, but when does the plot tell you what it is and where to use it?
Granted you get a vague item description, but is that all?
How would you know what to do with the “Ashen Mist Heart”
dark-souls-2
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Best Answer
The best hint lies in the item description:
Throughout the game you run into multiple interact-able giant corpses, one of which happens to be the only thing of significance behind a door that requires the King's Ring to access. Without the Ashen Mist Heart interacting with the corpses hints at coming back later (everything in the game that is interact-able has a purpose, there are no 'flavor' interactions that I know of, only ones that tell you do not have the required key. Either explicitly or implicitly).