NO CONTEXT BECAUSE SPOILERS: "Your finest mourneblade" does that mean there are other -mournes out there besides Frostmourne (and Shadowmourne technically but that's an axe, not made by the Runecarver, and no one seems to acknowledge it existing)?
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They did imply it could whisper to people (though it's never been clear how figurative vs literal that was) but it's never been portrayed as a fully sapient, talking blade with a personality the way Remornia and Vorpalia are is what I'm getting at.
When we, unavoidably, meet with Arthas soon™, they could throw in a line where he says that sometimes frostmourne talked to him, since it was the armour that the soul of Ner'zhul was bound to. It would also explain how fast his corruption was from the moment he picked it up.
