Thank you so much for the long and detailed answer!
I have a quite hero heavy army atm, but that's partly because getting more chainrasps 20x or grimghasts 10x cost alot of dough to buy new.
I started with the "Start collecting malignants" and then bought the heroes and grim/rasps quite cheap from the internet and a guy that had built them but not painted them.
I would love to use the Mortis Engine but it can't be an ally with Nighthaunts, same with Necromancer i've come to know.
I tried GHoN the last couple of games, and with all the gravesites and my GoS spectral lure + Mystic shield, and necromancer i was quite unstoppable in terms of healing, not to mention the command ability "Endless legion" which seem REALLY strong to me to be able to return a full unit back to life?
My strategy as of latley has just been swarm them with all my summonable units, cast alot of spells to give them minus to hit/wound or make them fight last.
Then just fly over them the next turn with my general and strike them with alot of damage from my relic: 5attacks +3, +2, -1, 3 Damage.
With about 5 spells, 2 of them is spectral lure, heal 1d6 to a unit, or bring back 1d6 + necromancer + gravesites i can easily stay alive long enough.
Even of they would wipe out a whole unit i can just bring them back with an command point.
Oh, and if i really want to mess with them, i just bring my Coven Throne with etheral amulet.
The rules are really badly written when it says in GHoN "All death wizards know an additional spell from one of the Lores of the Dead. Clearly not all death wizards huh.
Now, this may not be the most optional build, but it is what i has at my disposal.
Would love to get Arkham, or some deathrattle, but now i'm mostly focused in my etheral army.
Again, a big big thank you for taking your time and answer a newbie's questions!