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In Heroes of Might and Magic V, summoning units for Inferno is actively used.
Previously, there was simply a town portal spell instead. Now they've introduced this simplification.
Oh yes, in Heroes of Might and Magic III, demons also had a castle gate building.
Summoning demons is more useful at the beginning of a battle, but necromancy is not needed at the beginning of a battle. Besides, Necropolis also has ghosts. So there are no problems there.
