“Everything else is remixed, scrambled and placed in Khazad-dum’s various Levels and Deeps.”
And building stability is now, well, way more stable.
This means those who like to build upwards shouldn’t find their builds under constant stress all the time.

It’s only available in solo and offline play, however.
There’s better sound effects when you’re bashing orcs in combat, and disconnects should be less frequent.
The list of fixes sounds enormous.
