Where can I find the elite ranger skill Ferocious Strike?

I know it's in Talus Chute, but I'm not sure where on the map the boss spawns. If anyone knows it would be appreciated.

It's not the troll ranger boss I know, he has escape.

Check out this awesome link that'll solve all your problems on where bosses spawn:

http://www.xennon.co.uk/eliteskills/

Ah, it's spearhead peak. Guess my info was wrong, thanks.