UNIT - Creature Balance + Visual Changes

In my opinion, this problem is not solved by a mod at all, but by the battle settings. You can speed up the animations to almost instantaneous... I personally did.

The whole problem is that in the battle settings, the animation of absolutely all creatures is accelerated, but I like the standard animation dynamics of the battle, and I would not want to lose the aesthetic pleasure of watching the battle at a normal speed just because of a couple of creatures. For those for whom the visual aspect of the game is not important, they can turn the speed slider to the maximum, but I don't think there are many such people.

Bone Warriors – Stunning Strike, + Crippling Wound
Regarding skeletons: this is a suggestion.

Crippling Wound was given to ranged units, not melee units, for a reason in the original, because its purpose is to slow down the enemy while it is still far from friendly units. If you give it to a melee unit, especially one with a fairly average speed, then the meaning of it is lost, because the enemy unit will already almost reach the friendly units by the time these skeletons can attack it. This is not to mention that in retaliation, it will take a lot of damage, because there is no longer a chance of stunning, and they cannot boast of high survivability...

Regarding liches: they have this in the original, it makes sense to give them zombie infection, just for the sake of logic, but you removed the plague from them.

In 2.4, the "Plague" spell will be returned to Archliches; replacing this spell was not justified.

Regarding angels: they fly fast enough.

Although I don't consider some of the affected creatures to be slow, the teleport animation looks good for them.

This is exactly that case.

Another question: what is so good about the Archdemon's ability?

This is more of a tactical ability than a combat one. It allows you to either avoid unnecessary damage to your creatures (teleport a friendly creature out of the "hot spot"), or, conversely, "pull" an enemy creature into the thick of things, and then methodically focus damage on it.