There is nowhere else to go in the Dwarven Halls.
On Sir Patrick's property there is a teleporter pad west of the house (near the fence) you can use to get into the section where he keeps the deed that Sir Dante wants.
Mpenzak moves down in front of the Ducal inn after his cart gets burnt.
Talk to Rob in the Ducal inn to join the thieves guild to get the holy dagger. You don't need Sir Dante's help with that, just a level of Pickpocket and Lockpick (you can get a level of Lockpick inside the guild, and get a choice of skills for joining).
There are some doors, etc, that can not be opened by Lockpick, but need a key, or some other trigger to open (lever, quest event).
