Honestly, I don't quite understand a lot of the principles behind reincarnation itself, but that seems reasonable. Returning memories covering something a bit more subtle as well as recalling events or people makes sense enough to me.

[He looked over the blades for a moment, frowning in concentration.]

I believe they're called Black Keys, though don't ask me why. I'd guess they're sanctified weapons given the origin, so if we have an undead outbreak next I guess we'll know who to call.