O wise people, I need suggestions.

THe adventurers found out that some of their JL number are trapped in hell.  I would like to delay their entrance into Hell for a bit so I am trying to figure out a way to make sure they have to gather stuff to complete the ritual to get there (they have a mystical character who can put the stuff together).

Any help on mapping this out would be appreciated.

Good wizards make themselves awesome.  Great wizards make everyone around them awesome.