Walkthroughs for custom maps.

It's not entirely clear how to counter their defense on this map.

I have an idea: settle them in a city and attack with Titan's Thunder and Elixir of Life. All these heroes have an explosion ability, so after their mana is drained, all the troops will continue to stay in the Castle. Then, we keep pounding them with Titan's Thunder until we're blue in the face. The problem will be their ability to summon elementals (all of them) and clone (2 out of 3), which means we need to dispel their spells very regularly, and that means we'll have to tank against the archers for a while until they finish shooting, which means we'll need a substantial army (or seven good stacks of phoenixes, it's not clear yet). Interestingly, these heroes have no immunity to mind magic in any form, but blindness won't help here because of the need for constant dispelling.

Added 44 seconds later

With Crag Hack and Gundula?

On this map, they are our enemies. And even in this situation, they wouldn't save us.