The Price of Generosity
Horizon is a magical city heavily influenced by the Archmage. It holds unparalleled libraries of arcane lore, wizards busy with mysterious tasks and rival arcane guilds competing in all ways. While Concord has the high towers of the elves, Horizon depends much more on flying buildings and floating force ramps. Such constructs are probably a creation of the Archmage, and possibly channel tremendous magical energy originally harnessed by the Wizard King.