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I would stay true to the normal Wraith and Lord line:

WS4
BS4
S5
T5
W3
I2
A4(wraiths have 4 min)
Ld 10

then do the following:
Wraith flight so he doesnt need any phaseshifter
Whipcoils
rending on a 5+
Everliving
Sempiternal Weave
Rez Orb

The Wraith bodyguard:
Resurection Protocols

WS 4
BS 4
S 5
T 5
W 1
I 2
A 4
Ld 10

0-1 Choice, Equips like normal wraiths and costing 55 pts a pop to start, when joined by Nec they become a bodyguard unit and Nekh looses id char, they also become Fearless.

the lord would cost Somewhere to 200 pts

Voila