Hello all! After getting used to the Dark Knight toolkit at 70 and spamming dungeons for several nights, I have found an odd rotation that feels solid in terms of self healing, mitigation, and AOE threat. If this is a stupid rotation and I need to be doing something else please let me know. I haven't found much on Dark Knight theorycrafting yet. Please note that this is for you standard 3 mob pull (or more) and is not focused on damage.
Mana is now mitigation due to "The Blackest Night". The 2400 MP used for the ability will give me a 10k shield with my health pool, this is more than what a DA souleater will heal me for (SE is about a 3400 heal in my gear). Also for reference, a DA abyssal drain will heal me for about 1100 per target.
The rotation is pretty simple, after you have gathered all of the mobs and dumped your initial mana into the The Blackest Night and DA abyssal drain spam, you will hard slash into syphon stike while NOT doing a souleater to finish the combo. In terms of mana you will prioritize using "The Blackest Night" on CD followed by a DA abyssal drain after your syphon strike. You will also completely ignore the blood gauge (outside of Delirium). The reasoning is because there is no threat modifier on Quietus and it is on the GCD. I also save C+S for the MP regen as well.
If you think this is bad please let me know and share your knowledge as I would be curious to hear it.