World vs. World Sneak Attack
From December 16 through January 13, with every player kill in WvW, you’ll gain a point toward your world score. Use a finisher while your world has Borderlands Bloodlust to earn your world another point toward victory. To be extra sneaky, objectives under attack will not display white swords for the duration of this event.
— Official description
The event temporarily removed white swords that normally appear on objectives, such as towers or keeps in WvW, to encourage players to be more sneaky, as well as encourage players to defend valuable structures.
Earn increased rewards in WvW during Sneak Attack event!
+15% WXP (WvW only)
+15% Experience from Kills (WvW only)
+50% Magic Find (WvW only)
— Effect description