Board Thread:Lore Discussion/@comment-2.100.92.38-20130821124429/@comment-25047024-20140117214110

You should read them.

The Empire has strong connections with Akatosh. You know what happened when Dagon tried to invade. Akatosh (or Akatosh's avatar) pwned him. Akatosh cares for the Empire (at least for the Septim and Alessian Empire) and wouldn't let anyone invade it, which is also why Akatosh created the barrier between Mundus and Oblivion in the first place. He definetly wouldn't let his brother-shard invade.

The Mede Empire is something else,  though.