Theory time! BAM style. [RoW]

It's entirely possible that Ba-Ado-Mishram was of Honor before becoming Unmade. No theft necessary.

It does seem like the Nahel bond is at least shaped by Honor, as it's so heavily based around oaths. We can see similar thematic elements in the powers granted by the Scadrian shards, with Allomancy being the one power that doesn't require a supply of investiture (since it's of Preservation), and Hemalurgy requiring destruction (since it's of Ruin). I believe it's stated somewhere that this is not a conscious choice on the part of the vessels, and the most a vessel can do is alter some of the details (like when Harmony made it less painful to snap).

/r/Stormlight_Archive Thread