User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-6050823-20150131004204

Things You May Not Know About The Critical Brachydios(Info comes from MH4G)
 * When the Guild were looking through some ancient documents left behind in the past, they found a particular document that caught their eye. This document showed that Brachydios have been known about for a very long time while the Guild have only very recently discovered the Brachydios Species. This document also talked about some unusual Brachydios that were seen nicknamed the Critical Dual Arms. The Guild took part of this nickname and now call these individuals the Critical Brachydios.
 * Unlike normal Brachydios, these extremely rare Brachydios are noticeably covered in the slime mold on some parts of its body such as the tail, head, and back.
 * With normal individuals the slime mold on some parts aren't active due to whatever being in their salvia not activating the slime on it, however, the slime mold can be found all over a Brachydios' body.
 * The Critical Brachydios' slime mold is known as Explosive Slime.
 * The slime mold of a Critical Brachydios actually glows in pure darkness and reacts to impact taken from enemies by exploding over time.
 * The Critical Brachydios noticeably has a unique organ known as a Immortal Core. This organ has a special relationship with the slime mold plus supposedly helps the Brachydios live longer. This organ is the reason why the slime mold is so active compared to normal Brachydios, making its attacks more powerful and making the slime bold breed more rapidly than before.
 * The fist of a Critical Brachydios is called a Brach Destructive Fist. This fist allows it to perform violent attacks plus has a explosive radius beyond a Large Barrel Bomb.