Invisibility for the Town Hall.

What?! Nonsense? Seriously... You're using Aces when fighting neutrals (especially ranged units)? Stalkers with their ability are indispensable! You can pull off things with them that other races can only dream of! The same goes for the Enchantresses; paired with the Rangers, they mow down all the neutrals. Why aren't Enchantresses meant for melee combat? They hit hard, no weaker than other level 6 units; their HP is a bit low, but Paladins and Death Knights have similar HP. That's one thing. To prevent them from dispelling invisibility, you need to hide them first and then cast invisibility. After they move, it will be difficult to guess where they are, and there aren't that many mass spells anyway, plus, I don't think dark mass spells work on those who are invisible. Conclusion: these two units have amazing abilities; you just need to get used to using them.