Completely disappeared without a trace. And deserters, who should have been brought back from previous installments of Heroes.

we need more powerful neutral units, so that if you manage to add them to your army, you're awesome. And if you need to defeat them, that was a whole science in the third game: how to defeat 100 Azure Dragons and still not lose your entire army. There were such tactical wonders, but in the fifth game, I almost don't encounter them. In short, there should be more dragons, and they should be more powerful! And we should be able to hunt them (how much experience could be gained from them :D)

Added 17 minutes later

Instead of giving chaos magic to the Djinns, we should give it to the Efreet, and let the Djinns keep all sorts of bonuses. And another cool thing was hatred, so let them have someone to hate. After all, according to Arab myths, some were for light, and others for darkness. And that's how they fought...

I'm all for hatred. It's great when there are sworn enemies. Creatures should hate someone in particular.