This guide goes over the 4 sections I think about the game and will mention why you want each of those things. For a normal party I recommend trying to cover each bullet point I show to some degree. No one character can fully fill every bullet point by themselves, something will always need to be covered by someone else. This is really a video for my fellow "fill" players who try to cover everything the party may need... This is my attempt to formalize what roles exist in the game and why you want different things.
Chapters
0:00 Intro
1:00 Roles as a whole
2:44 Offense
6:22 Defenses
12:19 "Sumo match about snowballs on a hill"
12:45 Special
21:27 Out of Combat
23:32 Outro
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