I want to put a bit of a more lore-ish answer out there. A big thematic element of death knights is their runeblades. It’s most prominently represented as swords of course. But axes and polearms also have blades. So runes on them, that fits. Maces is obviously a bit more of a stretch, but I think it can be justified. Some maces are structured essentially as a bunch of blades around a handle. But I also like to think of it as a slight nod to the old wc2 death knights, who carried truncheons. Albeit big, magical truncheons.
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