I looked at the wiki and here on this forum and didn't see any discussion on this. If there is already a discussion, I apologize for missing it, please point me there.
I was curious about the elemental cells. What are the rules for these? I wanted to rank up a monster that needed 22 more cells, and I had 54 of the correct type, I think it was dark, but it wouldn't let me rank it up. It said I needed to have more of the monster's cells before I could fill with the elemental cells. However, it would allow me to use elementium. Are we limited to a max of 20 cells when using elemental cells? Any other limitations?