Preface

Berserk derives its power from pure adrenaline and rage, increasing the user's combat capability the lower their health gets. When the user hit a certain percentage of health, their body or eyes will exude a faint red glow as they enter the berserk mode. While berserking, the user will become numbed to pain, allowing them to focus on combat. In addition, they will physically grow stronger, or perform actions faster, giving them more damage capability.

Increasing Berserk will increase one's threshold for pain, eventually ignoring it altogether. Although berserk is best used by a melee fighter, its effect can be great for magic users as well, as it allows them to concentrate on casting spells without being distracted by pain. They also benefit from the increased action speed.

Passive Mechanics

Increased Speed	The user perform his or her action more quickly.
Raging Strength	Rage allows the user to hit harder.
Pain Tolerance	This allows the user to tolerate a lot of pain and replace it with a numb, albeit seemingly burning sensation.
Battle Focus	This mastery gives the user more control over their character in highly stressful and distracting situations, allowing them to focus on the fight at hand. This also helps magic caster concentrate while casting their spells.

Progression

0-29 Beginner	Your body feels tingly when you take a lot of damage. Berserk below 10% HP. Reduce pain by 10%.
30-99 Novice	Your body is adapting to pain and rage, but you are still very unskilled with the berserk state. Berserk below 20% HP. Reduce pain by 20%. Increase action speed by 10%. +2 in quick event.
100-199 Trained	You explode with rage, seemingly to forgetting to fight like you had trained and simply swing your weapons around like a madman. Berserk below 30% HP. Reduce pain by 30%. Increase action speed by 15%. +4 in quick event.
200-499 Proficient	You are giving in to the fury that courses through your blood as your health drops. Your fighting is more adapted for the berserked state now. Berserk below 40% HP. Reduce pain by 40%. Increase action speed by 20%. +6 in quick event.
500-999 Adept	You can do everything above, but better, your focus is sharpening. Berserk below 50% HP. Reduce pain by 50%. Increase action speed by 25%. +8 in quick event.
1000-1499 Expert	You Have become quite a demon on the battlefield at this point. Your focus in battle is over-riding the pure rage. Berserk below 70% HP. Reduce pain by 70%. Increase action speed by 35%. +12 in quick event.
1500 Mastered	Instead of pure rage, you can maintain a murderously calm mindset as you butcher your enemy, ignoring their attacks and the pain of damage dealt to you. You are a focused killing machine. Berserk below 80% HP. Feel no pain. Increase action speed by 50%. +16 in quick event.