Can someone tell me what this item does?

Hi summoners,
Just hit lv 60 and noticed this item in my level rewards, and I'm not sure what I need it for.

Just hit lv 60 and noticed this item in my level rewards, and I'm not sure what I need it for.

4
Comments
I really wish I kept a duel crystal.
Sometimes when Kabam do their 'Defeat Xxx using yyyy, finishing the battle with a medium/light/impossible attack'-type events, I wish I could do more than five duels a day, to get them cleared 🤷♂️
I miss Duel credits...
It would use a safety net Credit item, instead of wasting UNITS by accident.