I have a couple of these items that seem to be like the devil fruits. How do I use them to forge armor because I've plugged everything into the slots in the forgery but it doesn't let me forge. Or am i doing it wrong?

Also, how do you use legendary copper?

ссылка

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Hey! Sorry for long delay ;)
It's legendary fruits and it's used with legendary copper to craft these sets ссылка (starts with Рыцарь ада and everything below)
To use these items you need forge level 7 or more (level 7 for legendary fruit +0, level 8 for legendary fruit +1 and levels 9-10 for legendary fruit +2, level 9 makes 111-120 lv equipment, level 10 - 121-130 lv equipment)
To get more info you can check our wiki: ссылка it's in russian but you can use translator :)
Good luck!
If you have any questions - ask at any time, you'll get answer faster next time cuz i'm back from vacation