User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-166.216.130.171-20130327021717/@comment-3195217-20130327143235

If 'latent power' is the 'blue glowing arm' skill, then it happens when you get hit many times or stay in the same area as a large monster for about 5 minutes I think. It increases your critical and decreses you stamina consumption as AWC#1 said. And if it's the 'red glowing arm' skill, then it activates when the monster gets enraged. It gives you Affinity and attack boost. There's another skill when your arm glows red, and it's called 'full charge' or something. It's activated when your HP is full (It gives attack boost, other effests it may oor may not have I'm not sure about).