Forewarned
The Treason of Saruman#17 (x1)
Attachment
Boon
[0]
Skill.  

Permanent.

Setup: Attach to a Ranger hero.

Response: After attached hero is declared as a defender against a non-unique enemy, exhaust Forewarned to discard 1 shadow card from that enemy.

"Faint and far are the feet of our enemies."
-Aragorn, The Two Towers