Wtf is this skill?

Berserker Stance - Stance
For 5-10 seconds, you attack 33% faster than normal and gain 20% more Adrenaline each time you hit in melee. Berserker Stance ends if you use a skill.

Or, you could have just hovered your mouse over it?

i couldnt got the pic from a screen shot.

Then I guess is doesn't really matter what it does then - since you can't use it

i can now - bought it from npc.

muhaha