User blog comment:PitchBlack696/Monster Hunter Portable 3rd/@comment-69.91.1.248-20110122184239/@comment-2053489-20110122190915

Ruiner decreases the amount of damage that must be inflicted to a monster's body part to break. So breaking claws, horns and cutting tails goes faster.

Force Out activates for 2 minutes after figthing a large monster for 5 minutes. In those two minutes, you have increased affinity and lowered stamina consumption. After this boosting phase, you have to wait again 5 minutes for the skill to recharge. This continues in an eternal circle as long as you fight a boss. Force out+2 has just even more increased affinity and even less stamina use.