What would you add to Heroes? (creative ideas only!)

Well, in the third Heroes game, there was already something roughly similar. But adding the Conflux would be a good idea. It’s a really interesting Castle, but right now, there are only 5 units available from this Castle in the game: Elementals and Phoenix. We shouldn’t just shove that monstrous Black Knight in there, as it doesn’t really fit. So, if we add 2 more units to this Castle and add a few more neutral creatures to the game itself, it would turn out pretty well.