User blog comment:Kogath/Monster Hunter X Discussion/@comment-184612-20151028154219/@comment-27120688-20151028193451

Not necessarily hidden, just only certain Fatalis/C. Fatalis weapons could get them with just rare 7 (The highest rarity in non-G games, i think). Its like getting Blue sharpness as early as low rank (in 4g ive done it with a mixed armor set)