Why bother spending time and effort to create minions that easily die?
Even if only First Order Necromancer spells can be used, there are still AoE (Area of Effect) spells, like the pitifully low-damage "Bone Teeth" skill.
[Bone Teeth (White): Level 20, fixed damage of 200 + 120% Magic Damage bonus. (Each level up increases by a fixed 10 points of base damage, +5% Spell bonus, and the number of Bone Teeth +1, Spiritual Power consumption +10 points.)]
Lord Zi currently has a Soul Value of 5122 points and no equipment bonus to his spells, so the damage of a single Bone Tooth can reach 6300+ damage.
Level 20 Bone Teeth can condense 20 at a time, and the most notable feature is that this skill is instant cast with no cooldown!
Using this thing to clear mobs, aside from the somewhat high Spiritual Power consumption, it's quite good.