According to the "drop info" button you can find red shards/runes in Ailing Kingdom, blue in kingdom of the sands, green in battlefield, and purple/yellow in underworld. The issue is that according to the same "drop info", shards/rune drops max out at 1 star in Ailing kingdom madness, and two stars in kingdom of the sands madness. How am I supposed to farm two and three star red and blue shards/runes? Also, where's a good place to farm two star rainbow evolution runes? I've been farming underworld hard and keep getting one star and three star, but no two star.