Hmm. I disagree with your opinion about the Dark Elves regarding balance (I can't say anything about the others because I haven't played them much). Are Assassins better than Stalkers? That's debatable. Assassins are better at the beginning. When I have more than 50 of them, I transform them into Stalkers. You said that invisibility is useless, but that's something only someone who has used this ability a couple of times at most would say. And you didn't provide any arguments to support your point of view. In my opinion, it's a very useful ability. It allows you to avoid losses when any other race would suffer heavy casualties (it's especially effective against archers and mages – you make them invisible, attack with Chaos and finish them off with the same Stalkers, and sometimes with the help of the Succubi). This strategy really works, and not just occasionally, but consistently. Furies/Megeras are indeed well-balanced. When you have few, you choose Furies; when you have many, you choose Megeras. The third level – the new upgrade is probably only useful in specific situations; otherwise, the old one is better. The fourth level – this is where the imbalance lies! A quarter of the damage to enemies in the path instead of ignoring defense?! What nonsense! The fifth level is not better. Either a tiny 30-50 hit points for each, which is not very frequent for Hydras, or a quarter of the damage with acid when the Hydra is attacked. This is a useful ability, I've tested it. The sixth level is quite balanced; you can use either one. And the seventh level is also well done.