turn is very useful on the bats for the last fight
Deathblow is not required to get the quest solved
Enter the Shadow Mithril Mines, and to to just outside the Northeast gate (see Quest 233 - Mithril Mithril for info on how to get there)
go nw,d,nw,ne,ne
jump ledge
w,w,nw
hold pick
pick crack, then north
You will need to do pick crack until everyone is through
hold shovel
dig sand
This will open a "down" exit. moving down does not close the door, but you have to move down twice (to confirm you really want to go down) (party move does NOT work)
Prep for fight, recommend cold, air, fire, acid, earth, evil and stoneskin