Rhyme of the Slayer
Ered Mithrin Campaign Expansion #183 (x1)
Event
Boon
[1]
Song.  

Combat Action: Choose an enemy. That enemy gets –4 Attack until the end of the phase. The hero with Dragon-slayer attached gets +4 Attack while attacking that enemy this phase.

Grey now as tears, gleaming silver;
red then it rolled, roaring river:
foam dyed with blood flamed at sunset;
as beacons mountains burned at evening
–The Return of the King