LIttle backtory first;
Our gaming group has been fairly consistent for a few years now; we played Rise , and are now Halfway through Shattered Star; The players are fairly good at optimizing and have a good rule knowledge. We're only 3 and we have no big issue with the difficulty even in a dungeon focused AP like Shattered Star
Now we are planning our character for Return, and the 3 players want to play an Arcane Caster of some sorts : Sorceror, UC Summoner and Witch.
DM who played return, how would you imagine the major roadblocks be for such a group?