Wordwood

There's a nice website for looking at recipes. It's http://wordwood.merseine.us

I need to catch up on how to get crystal grade 26 and so on. I suppose it's in Zeia.
I assume elite 84 gives crystal grade 26

I still can't tell what it means by level difference yellow, red... I assume when you're fighting a monster that's plus or minus 5 from your level, then yo gain 15-% exp.