I only care about DRK so I'd suggest add passive to parry magic attacks with a DRK's weapon. And to make parry more good in general I'd say add a Parry rate to the Tank weapons. Kinda how a Shield has a block rate and strength. We already know Parry has 20% flat mitigation. So adding a parry rate on top of Parry stat would make it slightly better.

However in DRK's case if they could parry magic that would make up for it IMO.

Parry having counter spike damage could be pretty nice though.

But like blocking/parrying when OT the DRK/PLD can't use Reprisal/Shield Swipe at all.