[quote=@souleaterfan320]
<Snipped quote by Dynamics>

...huh. Im listening.
[/quote]

Why rely on a third source to define evil in the sword bearer? What if each one had its own ring—
*Attaches a 3D-printed ring to the base of each Soul weapon*
That automatically judged and stopped evil users? That way, even if there's nobody to use the ring to stop the sword wielder, the ring will stop him on its own.