The Silver Dark Blade is a Skulkin weapon used in LEGO's Ninjago theme. It appears to be a silver sword with a short hilt, a wide handguard, and a large, pockmarked blade that curves backwards near the tip.
It is said to be an improved version of the Dark Blade, made in limited supply due to its increased power. Possession of one indicates that the wielder has great battle skill - largely because the Silver Dark Blade is implied to have been won by Skulkin who destroyed their competitors on their way to claiming the blade.
The Golden Dark Blade is an even stronger version of the Silver Dark Blade.
A collector’s edition of the Dark Blade, the Silver Dark Blade was created in limited supply. It’s truly brutal, so only the most dangerous skeletons have one... they won it a deadly contest.