Talk:Upgrade/@comment-174.95.158.204-20150823232919

I played before, but stopped for a couple years. I started picking up the game again, but I'm lost on why I can't fuse certain cards. For example, I'm trying to upgrade my slime to 27, but some of my N cards have this white bar with their type (ie. Passion) and a number beside it, like 1 or 2. These N cards are blacked out and i can't use them to upgrade, does anyone know whats wrong?