Arcane Dominion, the Dark hand's elusive territory, was protected by a group of floating cities, every city that the Dark hand owned in the Dominion is smaller and less advanced than the floating cities they built in the Underworld, no obelisks, less Arcane masters and no undead legions but on the other hand they were full of mage towers and advanced golems that could be used as emotionless canon fodder.
Under the lead of the smartest Arcane hand mages, the golems started building advanced flying ships called the arks, one could see that in every floating city of the Dark hand an ark was being built, these arks would be used to transport part of the mages, golems and resources of the Dark hand into the Upperworld.