This mod adds rainbows to world gen, a bunch of decor for your awesome rainbow houses and some basic tools and armor. You grow magical plants to make rainbow diamonds and make tools and armor. You can search for rainbows which will soon have a leprechaun with them. defeat him and you can unlock certain things in the future, Mostly cosmetic but tons of fun!
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In regards to modpacks:
Just ask, I will probably say yes.Just ask though