For Twilight Nazgul, I'm leaning more towards Euk's latest version, with a couple slight additions. The deck has kind of evolved towards burden adding for corruption, which I think fits well with the Twilight Nazgul theme.
The Witch-king, Deathless Lord x2
Ulaire Attea, The Easterling x3
Ulaire Enquea, Ringwraith in Twilight x3
Ulaire Otsea, Ringwraith in Twilight x3
Ulaire Nertea, Winged Hunter x2
Morgul Skulker x2
Wisp of Pale Sheen x3
Fell Beast x2
Nazgul Blade x2
It Wants to be Found x3
Threshold of Shadow x3
Blade Tip x2
I think this version of Ulaire Nertea is a great addition to our Twilight Nazgul deck, as a starter deck. It's a cheap minion and the shadow player should be able to make decent use of its game text as starter decks tend to run multiculture quite often.
The deck is way too dispersed...
I like the idea of Nertea, except for he would be the only support to Twilight Enquea in the Ringbearer-wounding mechanism, and that depends on a variable that's outside your reach. Would work better with 
Resistance Becomes Unbearable or 
Under the Watching Eye, or even 
Orc Assassin if you spot 2 hobbit comps. Nevertheless, can be devastating against the Three Hunters or any fellowship with 4 cultures or more...
Only 2 
Fell Beast seem too little, because they will end up most of the time as visible pumps instead of a way of making a key nazgul fight twice (as Enquea).
Besides, 
Nazgul Blade would be better than 
Threshold of Shadow ONLY IF: a) bearer is fierce; or b) you can't spot 5 burdens AND the site is a battleground... otherwise is just a +1 strenght visible pump. 
Nazgul Sword could be overpowered if the deck made burdens with ease, but as most of the time 
Wisp of Pale Sheen won't survive and Enquea will wound a non-exhausted Frodo, by the time 3x 
It Wants to be Found gather 3 burdens your opponent's fellowship will have 
Armor or heavy fighters to counter the damage bonus... IMO add 
Nazgul Sword instead, a 4th 
IWtbF and a pump, or even 2x 
Frozen by Fear for the surprise element.
As for 
Wisp of Pale Sheen, it depends on either 
Peril or 
Spied From Above to be played at regroup. I think I ditched 
Spied From Above too early: there are 11 Nazgul with 3 or more vitality, so unless they face a rohan felowship or heavy wounding there could be 2 exertions available on the same nazgul at regroup phase. Otherwise 
Not Easily Destroyed could heal some wounds..... That would be 2x 
Spied From Above + 1x 
Not Easily Destroyed. The latter can turn 
Shotgun Enquea into a 'Gatling Enquea', that could be OP.
Conclusion: it has no focus. So it can't corrupt, by no means. The RB-wounding path is crippled since there's no Witch King, 
LotN; go the burden way instead: 4x 
It Wants To Be Found, 2x 
Nazgul Sword and 2x 
Drawn To Its Power, with many pumps to win/overwhelm and 3x 
Fell Beast to repeat the assault.