As I see leve's:
1. You do the leve alone and you get what you chose (lol, sometimes)..plus bonus for difficulties--if chosen.
2. You and (all) GROUP member(s) have the same leve(s): You all get what the Leve would give a solo player, plus...You may or may not get very high bonus points for 4-5 Stars and completions which a solo may not be able to do at higher lv. quests. (note that each player's leve is completed by that one run)
3. You have the leve and NONE of the group besides you have it: You get the leve stuff and the rest get about a thousand g. @ lower lv's, Plus...ALL group members get what's in the BOX if there is one that spawns.
For the most part casters get dick on SP/XP and as is a Square Party legacy--DD types get mucho. So hit stuff a lot with hand weapons or Sririt Dart type casts if you want Skill Ups too.
If you have a Leve it is IMPORTANT that others are invited to party to JOIN it...IF you come late, after the Leve is proc'd...you MUST talk to the crystal and join in--or maybe its in the side bar too, I dont have it up atm. Corredt theis if I'm off here.
I SO KNOW HOWEVER...That IF you don't JOIN in the correct way after the Leve Holder has taken it (the leve) you will find yourself (my case) healing what SHOULD BE PARTY MEMBERS...but are not...who SEEM to be fighting invisible enemies...or locked in still motion, but with their life draining out on the bar. By UNSEEN forces.
And you don't get any goodies from it either.
I THINK...that I remember IF one member (*group) takes a quest that others have...failure to complete, is a failure to complete for all who hold the leve. You cannot try it with another member same leve. That failed one will be removed from your list.
Please correct this as needed
tammany tzu