I'll just dive into the explanation:

HQ: Necron Lord (100)+Orb(40)+Disruption Field(5)
Total: 145

Elites: 5 Immortals (140)
Total: 140

Troops: 24 Warriors (432) in two squads of 12
Total: 432

Fast Attack: 2 Wraiths (82)
Total:82

Total: 799

Phase Out: 8

Any comments? This is just based on what I have now...