Since you've cleared out this level earlier there's not much down here now (see map).
Conversations with the Dead:
You can always talk to that crazy guy again. ;-)
Items to find:
You found everything... didn't you?
Points to note:
Not much. Just head for that crystal ladder going down to "We Can See In The Dark... Can You?".
Monsters to kill:
Are there any left? Watch your back! ;-)
Decision to make:
You see a crystal ladder going down. Descending to We Can See In The Dark... Can You?.