Stalfos are recurring enemies in The Legend of Zelda series. They are skeletal knights or soldiers common to dungeons and tombs. Stalfos vary differently in appearance and behavior in each installment, but generally share similar traits as undead enemies wielding Swords and sometimes Shields, or as athletic skeletons that attack with their bones or even skulls.
In the 2D Zelda games, Stalfos are usually depicted as common, weak enemies. Often they will jump away to evade Link's Sword when he attempts to swipe at them with it, and others may even throw their bones at him to retaliate. In the 3D console Zelda games, Stalfos are instead depicted as elite enemies or even mini-bosses, who skillfully wield weapons they use to attack Link with. These Stalfos usually take much more effort to take down.