I've been toying around with Nether Allegiance with ranged and the biggest issue was, which will apply here, is balancing the cool downs on the Combat Arts you want to use and the level of the skeletal warriors. The skills you've picked seem good, but I'd concentrate on aiming to reduce this cool down as much as you can with gear and the order in which you pick your skills.
Tactics Lore
Armor Lore
Dual Wield
Astral Lord Focus
Concentration
Constitution
Death Warrior Focus
Combat Discipline
Toughness
Astral Lord Lore
Dual wield needs 5 points in tactics to open it up ,so you can't have that as a 2nd skill. Concentration needs 5 points in ALF to open it up as well. So that's the build I'd probably start with given your choices, and then it's a matter of carefully sinking runes into NA without increasing the CD on the CAs too much. Oh and I chose combat disc, simply for the 10%, would leave that until really late level before sorting out the mastery. Dual Wield I'd leave at 1 point until a higher level as well and sink primarily into TL early on for the extra melee damage.