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Regarding this matter, we checked with the team in charge and were informed that this is a specification change implemented alongside the feature that allows you to adjust the strength of monsters appearing in the field.
To use the feature that allows you to adjust monster strength, you must have unlocked ★7 or higher monsters.
For details, please check the release notes and FAQ below.
If you have any questions or notice anything else, please feel free to let us know.
Thank you for your continued support of Monster Hunter Now.