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Note that the "end-game grinding" is unlike any other MMORPG. There are no dungeons or group content worth doing. You just grind on mobs by yourself forever. Why? So you can keep doing it.
Eh, it's "progressing your character" in whatever way you choose. Yes, you can grind endless to chase the next level, or you can chase the life skill rankings. Or you can do whatever seems like fun to you, such as building an Epheria Sailboat and continuing to pimp it out.