Chrome Rares are a new rarity first introduced in First Edition boxes of Heroes Clash. They are individually numbered from 1 to 100 and there are only ever going to be 100 copies of each Chrome Rare.
There are multiple unique Chrome Rares in the set. Each one is a Character card from the corresponding set.
The five characters in Heroes Clash are:
Ejiro Kirishima 1
Izuku Midoriya 2
Katsuki Bakugo 2
Shoto Todoroki 1
Tenya Iida 3
The five characters in Jet Burn are:
Dabi 3
Endeavor 3
Hawks 1
Izuku Midoriya 5
Katsuki Bakugo 4
The four characters in Dark Tournament are:
Hiei, Dragon Within
Kurama, Youko Unleashed
Kuwabara, Spirited Warrior
Yusuke, Team Leader