Agreed, most troops are an upgraded or downgraded Version of another.
So my created units would add some more 'unique abiiity' type units :
Ermor : Greater Skeleton (or Greater Longdead
) - same low stats as the current basic longdead, but after non-holy destruction (ie. banishment), rises from the ground where it Last fell every 5 turns to fight again during combat (until all undead leading commanders killed off, or no remaining units left on battlefield, or turn limit expires).
Any : Medusa - stone any non-shielded non-ethereal unit until end of combat at short-medium range. Max 3 units per battle. Stoned units have a huge protection boost and are nigh impregnable to damage, however cannot move nor attack. If any stoned unit's side wins the battle they are returned to normal at end of battle (effect gets dispelled). If battle is lost, destroy all stoned units at end of battle. Stoned commanders' units do not auto-rout.
Any : Giant Beetle - has the ability to devour any smaller sized unit. Flyers are immune. Devoured unit loses 1/4th of hp's per turn that heal the beetle [max 20hps per turn, any hp regeneration ability inactive on target unit while in this state. Undead units only lose hp's but do not heal the beetle]. Devoured unit cannot attack while 'in' the beetle. Effect Lasts until the units or beetle's death at which point beetle can devour another unit, or upon the beetles death the unit appears on the battlefield with whatever remaining hp's. Can come in size 3 and size 5 varieties.