Talk:Mystic Codes/@comment-33333479-20190310201837/@comment-37459050-20190322025946

The unlockable Mystic Codes that everybody has (Combat Uniform, Atlas, Mage Association) aren't really recommended for upgrading since their skills don't improve by level (e.g. their cooldown is the only thing that gets better by level.)

So you'd be best to be upgrading the Mystic Codes that are available during events (swimsuits, royal brand, 2004, etc.) These are pretty easy to max out, since their exp cap is ~8x less than the defaults. Give each one about 2 weeks of consistent playing and you'll max level them. These are the best to upgrade since most of these MC's do have parameters that upgrade for every level.

And if you've finished doing those MC's, I'd recommend upgrading the Arctic Region Mystic Code (if you're on JP) or any default MC of your choice. I will preface this, however, that the Arctic Region MC needs ~18x the experience than that of the event Mystic Codes. That'll take a solid 6-8 months to max level. It is definitely worth it, since the attack skill on it is the best that you can get on any MC.