Dark Knight Fake skill revamp

I one up'd it because of the time with the calculations and the unique idea with a glass cannon warrior. However I really don't see how any warrior could function as such. It's farfetch'd but doesn't really meet the criteria of what you'd expect from a warrior. Although a "samurai" warrior typically is a glass cannon, I find it typically under a theif or "swag" branch as I like to call it .

The reason I even made a dark knight was because it was intense. It hit the slowest out of all the branches, but hit hard and was versatile. In a game where defense didn't really matter, HP was your base and your only solid survivibility, dark knight had tons of it and shared it. Well actually this is how I felt about the dragon knight. The transition to dark knight fascinated me because, at the time, it was the only class that used it's buff to make 4th job power, and most of them were auto activated and undispelable. This gave the feeling of the "dark" presence that was beholder, it was a true summon that built on what you were used too rather than discarding every skill as worthless.

When I fantasized about my own edits on the dark knight, I wanted them to expand on the abilities of beholder. Instead of recoloring old skills, how about adding a skill which shrouds your equipment in it's presence. A dark aura from your weapon that increase it's attack speed/weapon attack. The higher the weapon speed the more hits you accumulate, the same skills with entirely different animation's involving the beholder. I feel like the entire 4th job for a dark knight should revolve around the beholder enhancing every stat and not removing the previous skills but enhancing them. This would also give kind of a fake 4th job skill advantage, could you imagine, all of your previous skills being enhanced 2.5x or something like that? It's like you suddenly refreshed 30 skills that are now reusable, rather than replaced.

Tldr;
Beholder enhances everything about your character, all skills have an animation involving him, and all the dragon stuff turns into demonic stuff.

Edit: I'm just adding my own perspective by no means am I saying my idea is better, as I said, a "samurai" like class branch makes this completely plausible

this is what i was looking for, i actually did most of what you suggested. i'd need you to explain about the "how any warrior could function as such" though.

i based this over the idea of tempering our minds rather than our body, have you seen those videos of a guy placing a speartip to his neck and leaning on it? i went kind of with that idea, we use our minds (MP) to make our bodies (HP) invincible, however, running out of MP (or what it would stand, concentration) would make the speartip cut our necks. that was the mojo i went for with the whole HP and MP shenanigans.

second job features dragon buster, which is still fairly slow, third job improves on it, and adds a faster skill, dragon fury, here's where the whole "honed mind" thing comes into play.

now, fourth job, i did add a new beholder skill, which is darkened morals, and it requires beholder (beholder is the one that casts the effect on you). berzerk i guess you could compare it to naruto's rock lee chakra doors, sacrificing the physical body for precise powerful strikes. we lower our own HP via sac and roar, to increase our damage.
now, do note that 4th job fury and crusher don't have an animation, i had planned for a darkened "beholder'd" version of them.

and if you check, i didn't remove any skills, only impale (which crusher does the same thing, albeit a bit slower without the hyper skill and on less targets)the whole revamp is about the dark knight enhancing it's previous attacking skills, and on fourth job doing so via beholder's darkness.

which skills did i remove that you didn't want removed? o.o and now, sorry i don't have visual cues of how each skill would be, i went more for the math of it at first ._.