Heroes 5.5 WarGame Edition - Tactical Edition.

I already wrote that sustain effects aren't needed – they are duplicated by the distraction effect from the summons.

I always thought they stacked, both of them.


I imagine it something like this: you choose a Haven structure, and inside that Haven structure, you can also upgrade to a full Chaos structure, or other structures from Haven and Chaos. The same goes for Dungeon and Necropolis.