Scorned Sword
Defeat a Scorn boss, or defeat a Guardian with a Sword in the Crucible.
"Warsat analysis has shown a resurgence in Scorn activity lately. Let's take out a high-value target to keep them on their toes. If you'd rather help out with live-fire drills for the rookies, bring a Sword to the Crucible. Shaxx is waiting." —Ana Bray