Well, hello there new player
I wouldn’t worry about trying to finish this Online Mission , just enjoy the story instead of trying to grind to 99 as fast as possible. All OM arks will be released once this season is over anyway, and there will be better arks in future missions. Also, I’d overlook ranks when trying to catch certain rare arks, as being picky can result in frustration because of their low spawn rates. I’ll give you a spoiler…
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There’s an item called grade booster which does exactly as it’s name suggests. It’s primarily acquired through PvP but sometimes it can also be found during online missions!