DRK changes that would make it really fun to play

[Archwizard]

Oh... oh no. There's so many imbalanced things here, and a few that would make the job feel so much worse.

Like, you want to add MULTIPLE 3s and 3.5s casting animation spells to a tank? Spells longer than the GCD, which means you would need to slot in Spell Speed just to make them bearable, on a tank, in ADDITION to its Skill Speed requirements?
... It would overnight create the argument not to combine those two stats into one, that's for sure... but gearing would be a nightmare...
You understand that PLD can make its spells instant, right? And generally prefers to since you can't Block, Parry, or move while casting? And also needs that time to weave in oGCDs like its mitigation? And even its hardcasts are half as long as what you propose?
Like, with the number of spells you put in, did you even consider how much of each fight a DRK would have to spend casting? I see 5 cast times here on a 60 sec CD, so ignoring MP for a second, that's over a quarter of your rotation every fight.
And you haven't even included a trait like PLD gets to be immune to interruption if something hits you too hard, which... tank.
The only reason you would ask for this is if you're a RPR main who loves hard-casting Communio at the end of Lemure Shroud and want every MP spender to feel like Communio... and forgot that Communio isn't even 3.5 sec cast. The only Black Mage spell that long is Flare, and at least they get Triplecast from that deal; ask them how they feel about long cast times and I swear to you they would never say "I'd play DRK if it had spells like us and no Swiftcast."

Every single MP skill* is on a CD, so if you manage to overcap on MP or don't have a chance to spend 3 seconds casting, tough luck. The MP costs themselves are all over the place and seem pretty arbitrary in spite of their CDs matching. Most of them are also on the GCD to boot... because they have a cast time.

* Except for Dark Driver... because you didn't explain at all what "Dark Driver" is, since it's not some classic skill for the job or recognizable attack like DRGs got from Nidhogg. The only thing that comes up from multiple web searches is that it's the title you get from "A Tankless Job 1 (Dark Knight)".
Is it some DRK-style Stardiver? ... Did you mean Dark Passenger?

A damage buff that costs HP had promise... until you mentioned that it costs HP on every hit.
Y'know how Bloodwhetting can fully heal a WAR in under 4 sec in AoE? Imagine that in the opposite direction.
What happens if the buff would lower you below 1 HP -- do you die? Does the buff fall off and waste the remainder of the CD?

Living Dead on 250% faster CD and 50% longer duration would be far and away the most overpowered Invuln available to any tank, since it would be Holmgang on steroids.
Admittedly Living Dead (and Holmgang)'s effects can probably offset the chance of Blood Weapon killing you, but then we're talking about popping your Invuln as part of your damage rotation, aren't we?

Your Absorb skill suggestions are probably the biggest offenders -- the EW change to Feint was partly inspired by how mob damage is unclear about its contributions from Strength vs Dexterity (we only just got confirmation on a QoL change to even see Physical vs Magical damage), and now you want to separate those effects? Like, do you happen to know offhand which bosses use Dex to attack?
The stats you have for Reprisal are completely bonkers, since it has the same potency as Passage (and a slightly longer duration to boot) at no uptime loss to the DRK.
And, for the kicker, you removed Dark Missionary in order to emphasize the Absorb spells and Reprisal as DRK's group-wide mitigation -- neat on paper, but what do you do when the enemy can't be targeted? Or when the enemy is completely Immune? Hell, what do you do if your roulette gives you two DRK tanks who can't stack the same debuff on the boss? Because those are issues with the existing Reprisal.

The only things I've seen in here that seem to nudge towards "making the job feel more fun to play" are just the notes to have some skills "rework the animation to feel more satisfying to use", which... isn't any specific in most cases and doesn't really impact gameplay.
Not to mention, personally I think Bloodspiller looks great as-is, it just doesn't feel proportionally impactful cuz it's just a weaker knockoff of Fell Cleave.