User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-5270386-20130405150531/@comment-216.48.138.26-20130405162914

It's droprate is similar to that of all rare items, so about 3-5%. I killed 12 Brachy's and capped 14 before I got my first Brachy gem. Good luck with that lol.