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Rebuilding is certainly a useful feature, but it doesn't personally bring me joy. It turns out that if you choose to play as Necromancers, for example, you'll be playing as them until the very end. And if your army does get diversified, it will only be with neutral monsters, which usually aren't eager to join our ranks. The same goes for rebuilding creature dwellings. In general, I think the idea of sticking to the race you chose at the beginning is not a good one. Everything becomes boring and monotonous. You grab the same types of castles and build the same buildings ten times over – this only causes sadness and a desire to quickly defeat everyone and go watch Teletubbies/Dom-2/Malakhov+ (underline the appropriate one) >_<