berserker rage

orientation, which gives anyone can Berserker Rage lvling the skill because the skill description does not change as for the skill lvling Knight Frenzy in the tank. Specifically the question what is the difference between BR lv1 and BR lv4 , I know how it sounds but I can never find it.

orientation, which gives anyone can Berserker Rage lvling the skill because the skill description does not change as for the skill lvling Knight Frenzy in the tank. Specifically the question what is the difference between BR lv1 and BR lv4 , I know how it sounds but I can never find it.
He wants to know what is the main difference between levels in Berserker Rage. Knight Frenzy buff info shows the numerical difference, but this is not the case with Berserker.

Beserk
Skill type: self-supporting skill
Cooldown 5min. 1.5s Cast time
Learning Level: 85/90/95/99
MP consumption: 38/41/45/47
During 60s. you receive the following:
1. physical attack +500 → 565 → 672 → 826
Physical defense +10%
P.Accuracy +10
Attack Speed ​​+20%
Critical Damage +10%
Speed ​​+30
Enhance the resistance of the debuff skills
2. During the final blow against the enemy, restores 20% HP
3. HP<60% →-P.Atk +10% P.Critical Rate +100
4. HP<30% → P.Atk. +30% P.Critical Rate +300
Usable when HP is below 60%

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