Errors and Mistakes

[Manly Man]

Well, for Harrowing Slice, that can be pretty easily solved by saying that you need to have a sword to use it; after all, they're all Dark Sword Techs, and you couldn't use any of the abilities in Tactics that these draw from without actually having a sword in hand. That honestly sounds like an easy enough fix: techs need swords to be used. It would then still be a good choice, but not an overpowered one, since you'd still likely be better off with two attacks than one critical (Sneak Attack dice, anyone?) when consecutive attacks become a thing for you.