Change Dark Mind to a third Blood Weapon/Price ability.
<in here>
Dark Mind: 20s duration, 40s recast. *cancels the effect of Blood Weapon, *cancels the effect of Blood Price. Reduces MP cost by 25%, reduces Abilities cooldowns by 30%.
Increase Price/Weapon to 20 second duration also.
Delirium + Blood Weapon: Extend Weapon duration by 10 seconds, WS/Spell recast enhanced from 10% reduction to 15%.
Delirium + Blood Price: Extend Price by 20 seconds, heal DRK for 1200 potency, Delirium CD reduced to 60s
Delirium + Dark Mind: Extend Mind by 10 seconds, resets C&S, DP, Salted Earth, TBN, & Shadow Wall cooldowns, Delirium CD reduced to 90s
Shadow Wall: 60s recast, 10s duration.
*Restores partial MP when damage is taken
*Erects a barrier nullifying 30% damage of the next 3 incoming attacks.
*Dark Arts effects: duration extended to 20s, the 3 attack limit is removed.
I don't think much will happen in improving mitigation unless the current Dark Mind is shoved in the woodchipper. So if it were changed to a Requiescat-esque ability, then Shadow Wall buffed can take its place.
The cooldown reduction component of 3.x Blood Weapon & AST Spear cards I always thought was an interesting component, though I know it wasn't entirely desired (at least for AST). I would like to see them brought back though, if perhaps just stronger than old Blood Weapon's % cooldown reduction (was too low). IDR what Spear cards were, 15%? 30% might be too high, but I just don't remember what they were in 3.x, and what ever they were was not high enough.
I would like that cooldown reduction buff for DRK because it's not just free potency buff either, with cooldowns reduced, there's more stress and pressure for DRK to manage their MP correctly. That I think would be a fun and appropriate skill ceiling.

Originally Posted by
Accelerating
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Decries the DPS loss of WAR using IB, suggest DRK use TBN for Auto Attacks auto attack, huh? I agree Defiance has problems, but that's less IB's problem and more Fell Cleave carrying too much water. When DRK is behind the other tanks in DPS, it's that much more pressure to not overexert defensive skills at the cost DPS. Something SE learned from 3.x PLD, And unlike PLD/WAR, when DRK 'turtles up,' they get next to nothing for it.