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The Dark Priest is perhaps the most useless class. It's not that difficult to obtain such a character, for example, when playing as Order (if there is Dark Magic in the university, take a Priest; if there is Light Magic, take a Necromancer), but its actual capabilities... Of course, combining Light and Dark magic, without any dilution (this refers to Might), will create a significant imbalance in the combat effectiveness of the two armies, but casting all of this with a single character means the battle will be over 10 times before you even get started. And the bonus is very weak. You can't "vampirize" much with magic, and if you really want to, there's 4th-level Death Magic (which can be combined with a much more pleasant martial class for such things). And Life has Heavenly Shield and Regeneration for survival.
The Demonologist looks extremely attractive (and in the Chaos castle, he's equipped with everything he needs). The strongest summons in the game, further enhanced by the class ability.
I haven't tried the Lich. The original Lich, if its ability does *not* apply 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: "Hello, my orderly 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 (there's a 4th-level mass spell). The Order Lord would be better off thinking about a Cardinal. There, magic will not only help the army but also increase its own survivability, and the bonus is more pleasant (although if the focus is on mechanisms, you can consider having the Lord collect vampires for the army in addition to his own troops).
The Ninja is serious in Equilibrium and very useless in the original. In the case of Equilibrium, we're talking about a scout with a bow and Death Magic for prestige, not a full-fledged Necromancer.
The Rogue is good already due to the combination of classes, which Death provides. In Equilibrium, it also has a fairly serious ability.