Hi!
I have a problem with interpretation of this skill. There is something like "duration: 90 s" in description and how does it work?
1. I have 90 s for killing enemies and gain 5 buffs of the rage
2. I activate it once and for every kill I gain 1 buff (max 5) for 90 s
Thank for the answer, Fray

You have 15 classpoints > You buff berserk rage [Your total stacks are now 1] > You kill 5 enemies with one power attack [Your total stacks are now 6] each of the stacks lasts for 90sec or untill you die. When the buffing stack[the very first one you cast] falls of you don't get stacks when you kill people.
You can tell when the buffing-stack falls off by simply looking at your arms - they won't have spikes out of it just blood.

Thanks. Now everything is clear.

damn you got some nerve , you waited 20 days for this ?!

Ummm... Yup I knew it all without info about last stack which ends ability