Running the train in Anemos was moderately enjoyable. Pagos seems to be leaning towards pure mob grinding in a game that was designed so that mob grinding is pretty much objectively wrong in any situation. Based on what I've seen and what I've read from others, this isn't just because people need to level to make the train efficient, but because NMs just don't spawn as much. Pagos is, as of now, looking like it may be the single worst thing ever put in this game.
