I have a couple of questions. Is all lvling done in the catacombs? Also, is it best to wait for a party to join? Does the monster spawn have anything to do with level of character or with party size?

http://forums.d2jsp.org/topic.php?t=43961870&f=276 start here and lmk if you have any further questions.

# of monsters correlates w/ the number of players in catas