Originally Posted by
Archwizard
There is also a third option.
HP becomes a resource for an attack on charges, but MP skills replenish your HP. Essentially the same A to C path, but routed through B -- the extra step giving you some flexibility in your tanking style.
It creates a possibility for self-sustain through MP-based skills which DRK badly needs, offers options for risk-reward by gambling an amount of HP you think is worthwhile, and gives you a loop so you aren't just overhealing with Souleater when you're offtanking, pooling your MP to heal right after a big spender or during bursts.
And, crucially, isn't something any other tank can do or justify, given Dark Knight's extensive history.
And then when you are main-tanking, they can go a step further with the PVP callback and have Dark Arts make your next cast of the HP spender free. If the attack's on a fixed number of charges and gaining/spending Dark Arts isn't a resource shared with any other type of ability, you're not wasting any resources if the boss doesn't break your bubble, just more efficiently staying alive.
Plus, it means that we can bring in classic Darkness skills and take AD back off CD for an MP cost.
Then we just have to figure out what to do with the Blood Gauge.