Frmorrison I believe is talking about
Nightstrike.
It certainly is worth discussion, as 10 Expertise and 10 Hit are great aggro stats, and the ranged slot doesn't get too much love for tanking.
Personally I use it for only my max threat set, favoring
Vengeful Gladiator's War Edge for most occasions. I could be entirely out of my mind though. The only gain is 8 Stam (and some Resilience) for worse aggro stats. Quigon does mention the
Vengeful Gladiator's Longbow which is very similar (-1 Crit, +4 AP) but carries a rating requirement (edit: and a much higher point cost).
I may have been blinded by the Epic > Blue, since I would almost always ditch 8 Stam for Expertise/Hit.
Edit again: I'm too dumb to notice it says "Ranged Attack Power" on the Longbow until it was pointed out.