Arandor
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if choosing without unique heroes:
Castle - not sure, Orin or Ingham
Rampart - Ivor
Tower - Theodore
Inferno - Zidar
Necropolis - Sandro, Isra (Izra)
Dungeon - Malekith, Gunnar, Deys
Stronghold - Craig Hack, Gurnisson (my first Hero)... they have a lot of good heroes in general.
Fortress - Stig, Tazar
Conflux - Moner
Be strong. Believe