I would main DRK no question. I mained DRK in FFXI for years, I would want Souleater to work differently though. In FFXI if you were doing it right SE would bring your HP down really quickly and make you kind of a selfish DPS as you soaked up so much MP from the healers vs. died, only later with abyssea and super zerging where you would get tons of potions this became a non-issue. I would rather have a darkness attatck that takes x% hp from me and add x% dmg. That way we can buff up for that ability / skill.
I can see DRK as a melee DPS with long range abilities/ magic. SO maybe have some combos or DoTs up close that would set you up for a proc of an instant cast spell which you can do when you need to run out of AoE. Or some mechanic that had you running in and out of physical damage range to keep buffs up. For example cast attack spells on mobs that give buffs to physical dps at start of fight, and then have physical dps grant extra casts for magic or have some magic buff. This would have you potentially running some rotations at a distance (or rebuff up close if u have proc for instant casts) and some rotations up close, which would make it different from any DPS classes currently in the game and would make you actually use DRK magic attacks, not just have DRK be a melee dps with some magic as a novelty. + would be that you can still do part of your rotation while running away from AoE or at a distance, balanced out by having an interruptable rotation up close if you are trying to rebuff physical dps by casting next to the mob.
