Whirling blades?

Hi guys,
I start the game a few days ago.
Following a guide atm " [1.0.2.0]Belgothian’s Slaughter"

The problem is, i cant get the whirling blades skill?
Where do we get that skill?
Thx!

Its a recipe drop “Seal of Blades” component, once you learn it you craft it from blacksmith

http://www.grimtools.com/db/items/8898

Level 90 component called Seal of Blades. You need to get the blueprint in order to craft it.

blueprint:
http://www.grimtools.com/db/items/7305

component:
http://www.grimtools.com/db/items/8898

note the “requires level 90”.

Thx. Is the blueprint rare to find?

No, not really. If you can farm Crucible on Challenger, you’ll get it quite quickly.
It actually takes more time farming for all required components to craft it.