Like most grindfest games, people wants to level up their character to make things easier for them in the future. At the same time, they're trying to figure out easier ways to level to achieve that goal.
I already have a Lv 58 Arme and Lv 67 Dio; the rest of my characters are Lv 52 and up. I'm trying to figure out ways to get them all to 67 for the Thunder Hammer weapons, but I would need to find out what skill(s) is the strongest to know how to kill strong monsters/bosses the fastest while leveling them in a dungeon. I don't PvP, so it usually takes me a while.