Shadowhunters's primary weapons. In the idle mode, a seraph blade is just like a wand or tube of a dully glowing silver. When it is active as a weapon, it has a shape of a knife which is clear as glass, with a glowing hilt, wickedly sharp and nearly as long as humans' forearm. There are three kinds of seraph blade: sansanvi, sanvi, and semangelaf. In order to activate the blade, the user has to utter its name. Seraph blades have glow or light which are bright enough to light dark places.