Oh. You just need to reach Ace tier that you have already obtained. You need to reach the Ace tier in 8 of the last 10 seasons, @ΡΡΡ. This is one the requirements to submit the application to become an investigator.
You need to reach Ace tier or above in 8 of the last 10 seasons. One season lasts for about 2 months. Start time and end time of a season can be found on the top-right corner of the event page, @ΡΡΡ.
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