I have two lists ready to go and I hope to get them each playtested within the next month.
1. The First Cohort:
(Grand Host of Nagash)
The First Cohort battalion
Nagash
spells

ecrepify, Soulpike, Soul Harvest
Morghast Archai with Halberds
40 skeletons, swords
20 skeletons, spears
20 skeletons, spears
Necromancer
artefact: Gravesand Timeglass
spell:Overwhelming Dread
Necromancer
artefact: Ossific Diadem
spell:Fading Vigour
2000 points
Notes: part of the reason I'm running some spears is that's how my skellies are modeled. The other part is having 4 ranks of attacks on a target(s) with the front 2 ranks being swords. Granted, this would usually require that I be charged, but if I'm within 6" or so, I can just make a whole when the front skellies die and charge the supporting unit in.
2. The Walking Dread
(Legion of Blood)
Vampire Lord on Zombie Dragon
ancient shield, deathlance
artefact: Ring of Dominion
command trait: Walking Death
spell: spirit gale
Bloodseeker Palanquin
artefact: Oubliette Arcana
spell: Amaranthine Orb
Necromancer
spell: Overwhelming Dread
Bat Swarms x2
Deathmarch battalion
Wight King with Black Axe
Black Knights x5
Grave Guard x5 with swords
Skeletons x 40 with swords
Skeletons x 20 with spears
Skeletons x 20 with spears
1980 points
Notes: Despite its name, this should be a fairly fast list and has a lot of debuffs. Just about everything should hit REALLY hard, especially the vamp lord. The vamp lord should have +2 attacks for all of its weapons (mount included) in almost every battle round. +1 attack comes from the Legion of Blood trait (permanent) and the other +1 would come from the Palanquin. Running them near each other, behind the skeletons, should keep a hero slain fairly often. The palanquin would also have +1 attack perpetually, with the probable +2.The extra attacks, compounded by the 1/3 chance of swinging your opponent's weapon (with +1 or 2 attacks also) and dealing mortal wounds on 6+ to hit will be pretty epic. Even if they manage to bring down the vampires, they'll still have to deal with a giant
horde of skellies.