I haven't tried the Lich. The original one, if its ability doesn't extend to ranged attacks, is a very questionable combination, not supported by any bonus. The one from Equilibrium is excellent, especially for Chaos. Lich + Black Dragons: "Well, hello there, my dear friend."
The Assassin is quite good, in two directions. Either it's a mobile Warrior, cursing its enemies, or a Sorcerer with a bonus to initiative.
The Dark Lord is unnecessary. The Transmuter and Necromancy will raise the "growth" sufficiently on their own, and the class bonus is a simple 2nd-level spell that is easier to cast through a spellbook (for 4 targets). The Lord of Order would be better off considering the Cardinal; there, magic will not only help the army but also increase his own survivability, and the bonus is more pleasant (although if the focus is on mechanisms, you might consider having the Lord collect vampires for his army in addition to his own troops).
The Ninja is serious in Equilibrium and quite useless in the original. In the case of Equilibrium, we are talking about a scout with a bow and Death magic for prestige, not a full-fledged Necromancer.
The Rogue is good due to the combination of classes, which is exactly what Death needs. In Equilibrium, he also has a quite serious ability.
The Lich ages with any attack, including ranged attacks. The question is, how will the Lich help your creatures? The Lich is not a Fire Guardian; your creatures will easily defeat him with their breath attack, and you can't apply buffs to your creatures without a ring. If you're talking about debuffs to reduce damage to your creatures and increase their damage, then a Cardinal or a Fire Guardian with Armageddon is, in my opinion, more useful.
The usefulness of the Assassin is debatable - you can cast the speed boost as a mass spell, and you can only run away from slow creatures; for a mage, an earlier turn? For a class that has martial skills, it's not very useful; in most cases, the mage will shoot first before casting debuffs, and Hand of Death often hits an invisible target at the beginning of the battle.
You forgot about the Witch Hunter for the Lord :).
In Equilibrium, the Ninja is a Beholder-like hero - what could be better? :)
The combination of tactics and Death magic - what's so good about it? It will take down a creature with the very first shot
