Dark Knight

Nerf:
The Blackest Night
25 second cooldown.

Buff:
Shadow Wall
120 second cooldown. For 10 seconds reduces incoming damage by 30%. Grants the effects of Blood Price for its duration(Ignores Grit Restriction). Restores MP(1 Dark Arts Equivalent).

Delirium
No Blood Cost. Extends the duration of Blood Weapon and Blood Price by 9 seconds/15 seconds. Doubles the effects granted by Blood Weapon and Blood Price for their duration.

The Blackest Night.
6 second duration. When broken for the full amount of shielding, grants 50 Blood and gain the effects of Black Arts(Black Arts is used as a Dark Arts effect when Dark Arts is not active, 6 seconds duration).

Dark Passenger
150 potency. Costs a full/half Dark Arts.

Dark Mind
Reduces incoming damage by 15%. Dark Arts effect: Reduces incoming damage by 15% for allies within range. 90 second cooldown.

Bloodspiller
Delivers an attack with a potency of 500.
Dark Arts Potency: 700
Dark Arts effect: Restores 20 Blood.
Ignores the damage penalty of Grit.

"New" Dark Dance
120 second cooldown. Gain 100% Parry chance.

QoL:
Plunge
Removed animation lock. Increases Blood Gauge by 10.

Carve and Spit
Removed Dark Arts effect.
Deals 450 Potency baseline.
Costs MP(1 Dark Arts Worth.)

Living Dead
Swap current HP and MP percentages at the end of Walking Dead.
Removed Healing requirements.

Warrior

Nerf:
Defiance/Deliverance
Switching stances now costs 20 Beast Gauge. (Activating Stances from No stance costs nothing, Turning off Stances puts them into cooldown for 10 seconds.)

Maim
No longer applies Slash Resist Down.

Buff:
Shake it Off
Grants up to 10% of the Warrior's current HP as a shield to nearby allies.


... I guess this is just another wishlist rather than a prediction.

Prediction > Unsatisfactory buffs, if any, to hype up 5.0 Dark Knight revamp.
> Random Fell Cleave Buff.
> Holy Spirit nerfed by 10 potency.