I mean to make DRK, you start with a base 1 2 3 combo. Then you add one or two OGCDs to weave. Then you add three tank CDs that match up with the other tanks.

After that, what it comes down to is how to engineer the burst phase. The way they did their burst phase was with Delirium and Blood Weapon, but we can definitely do better than that. For one, we don't need extra skills to make something like Delirium function: The main combo can be buffed during delirium and save the extra controls just fine. The blood weapon package was also basically three skills stuck together as it is meant to speed up the use of flood.

Honestly, blood weapon should have been doing what it's namesake is and making attacks heal the DRK, not boost MP regeneration. It's literally drinking the life out of someone.

Ugh, like thinking about this Dark Arts should be the skill that transforms the main combo into a more lethal combo and blood weapon should be the skill that helps the DRK survive, since some self healing with TBN would probably make them far better at surviving dungeons. The entire Delirium combo is just totally out of left field and has been since Shadowbringers.

All the OGCDs are basically there as filler / flavor for the job and do extra damage. That's it.