If You Were A Class/Job Designer...

[Violette]

Much lazier and would do a full write up but working, so let's be lazy:

Paladin:
Rage of Halone: Reduces physical damage by 10%. Paladin gains 15s of 5% increase crit chance.
#yolodeeps

Warrior:
Storm's Eye: Debuff reduced to 10 seconds.

Can no longer keep it up 100% of the time unless spamming it continuously.

Dark Knight:
Blood Price: When grit is turned off, drk's instead consume 1/2 the dark arts cost as hp to activate it when blood price is turned on.

PLD/DRK:
Grit/ShO/SwO: Now have a 1.5s recast.

Dizcuz

@J'ioh: If pld and drk get slash debuff, Monk is basically locked out of content in favor of drg/nin because nin's big dps loss (dancing edge applications), is mitigated.