Probably by design, but the echo could use changing if it is.

I killed this guy, but unfortunately the weapon I was using wasn't the unholy blessed one that I thought it was. Unsurprisingly, no charge.

Some time later (maybe a day, if not, at least several hours later), I kill him with a properly unholy blessed weapon. The echo I got tells me that my weapon had already fed on his soul, even though it was, I think, the first kill I'd actually made with an unholy weapon in hand.

Also, does this mean that the first one, where I didn't have an unholy in hand, would have counted towards controls, but the second one would not have? That feels difficult to explain if so.

n/t

So long, and thanks for all the fish!

But that still leaves the incorrect echo. It says my weapon has already fed on him, when it hasn't.

Also, I'm not sure that killing someone a day later (or even if it was same day, but 6 hours later), is necessarily a multi-kill. But I'm quite happy for you to continue to class it as such.