The identity for DRK has always been a tank that converts MP into damage. They’re not going to do the traditional path of having a DRK concert hp into damage for obvious reasons, so they choose MP. The core of the job was using Dark Arts to boost various skills offset by the fact that Darkside killed your refresh so you had to use Blood Weapon and Syphon Strike to get it back. In theory, Dark Arts should have boosted all our skills and we should have had to manage our resources. In practice, the choice was really whether you DA’ed Syphon or Souleater and hope you picked the one that cries. The current iteration is just more straight forward since we just convert mana into either Edge for more damage or TBN for defense.