First the List:
The Grand Legion of Nagash
Lords (1225)
Nagash - 1000 points
Master Necromancer, Lvl 3 Lore of Vampires, Black Periapt, Ironcurse Icon - 225 points
Heroes (169)
Wight King, Dragonhelm, Dawnstone, Shield, Barded Skeletal Steed, Battle Standard Bearer - 169 points
Core (630)
5 Skeleton Horse Archers, Full Command - 100 points
5 Skeleton Horse Archers, Full Command - 100 points
5 Skeleton Horse Archers, Full Command - 100 points
5 Skeleton Horse Archers, Full Command - 100 points
20 Zombies - 60 points
25 zombies, Full Command - 85 points
25 zombies, Full Command - 85 points
Special (160)
2 Morghast Harbringers - 160 points
Rare (310)
Hierotitan - 175 points
Casket of Souls - 135
The list wants to dominate the magic phase so Nagash can summon whatever units are necessary to drown the enemy in a never-ending tide of Undead.
I'll explain the choices per unit below:
Nagash - No explaining to do here, the list is built around him.
Master Necromancer - He is the Black Periapt caddy, his main goal is to expand the Zombies and make sure I can guarantee Van Hel's Dance Macabre and still get the juicy spells from other lores for Nagash.
Wight King - With Nagash and the Morghasts countering crumble, I wanted to add a BSB for the -4 to crumble in the army. In this configuration he has a 1+ rerollable armour save, which means he can actually hold entire blocks in infantry on his own. That horde of 40 Halbediers? Park this guy in front of them and they are going nowhere.
Skeleton Horse Archers - In my humble opinion the best chaff the Undead Legions has to offer. Trough scouting I dictate early game movement which I think is very important since Nagash needs a turn or two to build his army.
Zombies - The unit without command is the bunker for the Master Necromancer, the other two form the main tarpits.
Morghast Harbringers - These two stay just behind the front line for the reduced crumble. I think that with the correct spells to buff them they can be used as excellent character assassins. For example: Birona's Timewarp and Djaf's Cursed Blades means you have ten attacks with a 1/3rd chance of killing blow and Always Strike First.
Hierotitan - This guys serves two purposes: 1) he is going to boost Nagash's casting. 2) he is going to catch cannonballs.
Casket of Souls - More Power Dice for Nagash and the bound spell is great.
So, first attempt, I think it can definitely be improved upon. What do you think?